Efficient CMOS amplifier with increased transconductance
First Claim
1. An RF IC having an improved transconductance, the device comprising:
- a first active device of a first conductivity type having a first transconductance, a gate, a drain and a source;
a second active device of a second conductivity type having a second transconductance, a gate, a drain and a source, said second active device coupled in series with said first active device and said gate of said first active device is coupled to said gate of said second active device;
a current reuse circuit is coupled to said first active device and said second active device wherein a current flowing from said drain of said first active device is reused in said second active device;
a low pass filter coupled between said current reuse circuit and said drain of said first active device and said drain of said second active device;
whereby a total transconductance of said first and second transconductances is increased without an increased current utilization and without an increase in noise.
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Accused Products
Abstract
An RF IC having an improved transconductance comprises a first active device of a first conductance type having a gate, a drain and a source and a second active device of a second conductance type having a gate, a drain and a source. The second active device is coupled in series with the first active device. The gate of the first active device is coupled to the gate of the second active device. A current reuse circuit is coupled to the first active device and the second active device wherein a current flowing from the drain of the first active device is reused in the second active device. Whereby transconductance is increased without an increased current utilization and without an increase in noise.
28 Citations
17 Claims
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1. An RF IC having an improved transconductance, the device comprising:
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a first active device of a first conductivity type having a first transconductance, a gate, a drain and a source; a second active device of a second conductivity type having a second transconductance, a gate, a drain and a source, said second active device coupled in series with said first active device and said gate of said first active device is coupled to said gate of said second active device; a current reuse circuit is coupled to said first active device and said second active device wherein a current flowing from said drain of said first active device is reused in said second active device; a low pass filter coupled between said current reuse circuit and said drain of said first active device and said drain of said second active device; whereby a total transconductance of said first and second transconductances is increased without an increased current utilization and without an increase in noise. - View Dependent Claims (2, 3, 5, 6)
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4. The device as recited in claim I wherein said current reuse circuit steers current into said first active device and said second active device.
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7. An RF LNA IC having an improved transconductance, the device comprising:
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a first active device of a first conductivity type having a first transconductance, a gate, a drain and a source; a second active device of a second conductivity type having a second transconductance, a gate, a drain and a source, said second active device coupled in series with said first active device and said gate of said first active device is coupled to said gate of said second active device; a current reuse circuit is coupled to said first active device and said second active device wherein a current flowing from said drain of said first active device is reused in said second active device; a low pass filter coupled between said current reuse circuit and said drain of said first active device and said drain of said second active device; whereby a total transconductance of said first and second transconductances is increased without an increased current utilization and without an increase in noise. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An RF mixer having an improved transconductance, the device comprising:
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a first active device of a first conductivity type having a first transconductance, a gate, a drain and a source; a second active device of a second conductivity type having a second transconductance, a gate, a drain and a source, said second active device coupled in series with said first active device and said gate of said first active device is coupled to said gate of said second active device; a current reuse circuit is coupled to said first active device and said second active device wherein a current flowing from said drain of said first active device is reused in said second active device; a low pass filter coupled between said current reuse circuit and said drain of said first active device and said drain of said second active device; whereby a total transconductance of said first and second transconductances is increased without an increased current utilization and without an increase in noise. - View Dependent Claims (14, 15, 16, 17)
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Specification