High speed comparator having two differential amplifier stages and latch stage
First Claim
Patent Images
1. A comparator comprising:
- a first differential amplifier stage for receiving first and second input signals and amplifying the difference in potential therebetween to generate first and second differential signals;
a second differential amplifier stage, connected to said first differential amplifier stage, for receiving said first and second differential signals and amplifying the difference in potential therebetween to generate third and fourth differential signals;
a latch stage, connected to said second differential amplifier stage, for positively feeding said third and fourth differential signals back to said second differential amplifier to latch said third and fourth differential signals;
a first differential switch circuit, connected to said second differential stage and said latch stage, for alternately activating said second differential amplifier stage and said latch stage; and
a second differential switch circuit, connected to said first differential stage and said latch stage, for alternately activating said first differential stage and said latch stage.
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Abstract
In a comparator including a first differential amplifier stage for amplifying the difference in potential between input signals, a second differential amplifier stage for amplifying the difference in potential between output signals of the first differential amplifier stage, and a latch stage for positively feeding output signals of the second amplifier stage back thereto, a first differential switch circuit alternately activates the second differential amplifier stage and the latch stage, and a second differential switch circuit alternately activates the first differential amplifier stage and the latch stage.
74 Citations
18 Claims
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1. A comparator comprising:
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a first differential amplifier stage for receiving first and second input signals and amplifying the difference in potential therebetween to generate first and second differential signals; a second differential amplifier stage, connected to said first differential amplifier stage, for receiving said first and second differential signals and amplifying the difference in potential therebetween to generate third and fourth differential signals; a latch stage, connected to said second differential amplifier stage, for positively feeding said third and fourth differential signals back to said second differential amplifier to latch said third and fourth differential signals; a first differential switch circuit, connected to said second differential stage and said latch stage, for alternately activating said second differential amplifier stage and said latch stage; and a second differential switch circuit, connected to said first differential stage and said latch stage, for alternately activating said first differential stage and said latch stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A comparator comprising:
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first and second power supply terminals; first, second, third and fourth resistors connected to said first power supply terminal; a first transistor having a collector connected to said first resistor, a base for receiving a first input signal, and an emitter; a second transistor having a collector connected to said second resistor, a base for receiving a second input signal, and an emitter; a third transistor having a collector connected to said third resistor, a base connected to said second resistor, and an emitter; a fourth transistor having a collector connected to said fourth resistor, a base connected to said first resistor, and an emitter; a fifth transistor having a collector connected to said third resistor, a base connected to said fourth resistor, and an emitter; a sixth transistor having a connector connected to said fourth resistor, a base collected to said third resistor, and an emitter; a seventh transistor having a collector connected to the emitters of said first and second transistors, a base for receiving a first control signal, and an emitter; an eighth transistor having a collector connected to the emitters of said third and fourth transistors, a base for receiving said first control signal; a ninth transistor having a collector connected to the emitters of said fifth and sixth transistors, a base for receiving a second control signal opposite in phase to said first control signal, and an emitter; a tenth transistor having a collector connected to the emitters of said fifth and sixth transistors, a base for receiving said second control signal, and an emitter; a first constant current source connected to the emitters of said seventh and tenth transistors and to said second power supply terminal; and a second constant current source connected to the emitters of said eighth and ninth transistors and to said second power supply terminal. - View Dependent Claims (12)
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13. A comparator comprising:
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first and second power supply terminals; first, second, third and fourth resistors connected to said first power supply terminal; a first transistor having a collector connected to said first resistor, a base for receiving a first input signal, and an emitter; a second transistor having a collector connected to said second resistor, a base for receiving a second input signal, and an emitter; a third transistor having a collector connected to said third resistor, a base connected to said second resistor, and an emitter; a fourth transistor having a collector connected to said fourth resistor, a base connected to said first resistor, and an emitter; a fifth transistor having a collector connected to said third resistor, a base connected to said fourth resistor, and an emitter; a sixth transistor having a collector connected to said fourth resistor, a base connected to said third resistor, and an emitter; a seventh transistor having a collector connected to the emitters of said first and second transistors, a base for receiving a first control signal, and an emitter; an eighth transistor having a collector connected to the emitters of said third and fourth transistors, a base for receiving said first control signal; a ninth transistor having a collector connected to the emitters of said fifth and sixth transistors, a base for receiving a second control signal opposite in phase to said first control signal, and an emitter; a tenth transistor having a collector connected to the emitters of said fifth and sixth transistors, a base for receiving said second control signal, and an emitter; and a constant current source connected to the emitters of said seventh, eighth, ninth and tenth transistors and to said second power supply terminal.
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14. A comparator comprising:
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first and second power supply terminals; first, second, third and fourth resistors connected to said first power supply terminal; a first transistor having a collector connected to said first resistor, a base for receiving a first input signal, and an emitter; a second transistor having a collector connected to said second resistor, a base for receiving a second input signal, and an emitter; a third transistor having a collector connected to said third resistor, a base connected to said second resistor, and an emitter; a fourth transistor having a collector connected to said fourth resistor, a base connected to said first resistor, and an emitter; a fifth transistor having a collector connected to said third resistor, a base connected to said fourth resistor, and an emitter; a sixth transistor having a collector connected to said fourth resistor, a base connected to said third resistor, and an emitter; a seventh transistor having a collector connected to the emitters of said first and second transistors, a base for receiving a first control signal, and an emitter; an eighth transistor having a collector connected to the emitters of said third and fourth transistors, a base for receiving said first control signal; a ninth transistor having a collector connected to the emitters of said fifth and sixth transistors, a base for receiving a second control signal opposite in phase to said first control signal, and an emitter; and a constant current source connected to the emitters of said seventh, eighth and ninth transistors and to said second power supply terminal.
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15. A comparator comprising:
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first and second power supply terminals; first, second, third and fourth resistors connected to said first power supply terminal; a first transistor having a drain connected to said first resistor, a gate for receiving a first input signal, and a source; a second transistor having a drain connected to said second resistor, a gate for receiving a second input signal, and a source; a third transistor having a drain connected to said third resistor, a gate connected to said second resistor, and a source; a fourth transistor having a drain connected to said fourth resistor, a gate connected to said first resistor, and a source; a fifth transistor having a drain connected to said third resistor, a gate connected to said fourth resistor, and a source; a sixth transistor having a drain connected to said fourth resistor, a gate connected to said third resistor, and a source; a seventh transistor having a drain connected to the sources of said first and second transistors, a gate for receiving a first control signal, and a source; an eighth transistor having a drain connected to the sources of said third and fourth transistors, a gate for receiving said first control signal; a ninth transistor having a drain connected to the sources of said fifth and sixth transistors, a gate for receiving a second control signal opposite in phase to said first control signal, and a source; a tenth transistor having a drain connected to the sources of said fifth and sixth transistors, a gate for receiving said second control signal, and a source; a first constant current source connected to the sources of said seventh and tenth transistors and to said second power supply terminal; and a second constant current source connected to the sources of said eighth and ninth transistors and to said second power supply terminal. - View Dependent Claims (16)
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17. A comparator comprising:
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first and second power supply terminals; first, second, third and fourth resistors connected to said first power supply terminal; a first transistor having a drain connected to said first resistor, a gate for receiving a first input signal, and a source; a second transistor having a drain connected to said second resistor, a gate for receiving a second input signal, and a source, a third transistor having a drain connected to said third resistor, a gate connected to said second resistor, and a source; a fourth transistor having a drain connected to said fourth resistor, a gate connected to said first resistor, and a source; a fifth transistor having a drain connected to said third resistor, a gate connected to said fourth resistor, and a source; a sixth transistor having a drain connected to said fourth resistor, a gate connected to said third resistor, and a source; a seventh transistor having a drain connected to the sources of said first and second transistors, a gate for receiving a first control signal, and a source; an eighth transistor having a drain connected to the emitters of said third and fourth transistors, a gate for receiving said first control signal; a ninth transistor having a drain connected to the sources of said fifth and sixth transistors, a gate for receiving a second control signal opposite in phase to said first control signal, and a source; a tenth transistor having a drain connected to the sources of said fifth and sixth transistors, a gate for receiving said second control signal, and a source; and a constant current source connected to the sources of said seventh, eighth, ninth and tenth transistors and to said second power supply terminal.
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18. A comparator comprising:
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first and second power supply terminals; first, second, third and fourth resistors connected to said first power supply terminal; a first transistor having a drain connected to said first resistor, a gate for receiving a first input signal, and a source; a second transistor having a drain connected to said second resistor, a gate for receiving a second input signal, and a source, a third transistor having a drain connected to said third resistor, a gate connected to said second resistor, and a source; a fourth transistor having a drain connected to said fourth resistor, a gate connected to said first resistor, and a source; a fifth transistor having a drain connected to said third resistor, a gate connected to said fourth resistor, and a source; a sixth transistor having a drain connected to said fourth resistor, a gate connected to said third resistor, and a source; a seventh transistor having a drain connected to the sources of said first and second transistors, a gate for receiving a first control signal, and a source; an eighth transistor having a drain connected to the sources of said third and fourth transistors, a gate for receiving said first control signal; a ninth transistor having a drain connected to the sources of said fifth and sixth transistors, a gate for receiving a second control signal opposite in phase to said first control signal, and a source; and a constant current source connected to the sources of said seventh, eighth and ninth transistors and to said second power supply terminal.
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Specification