Gm-C tuning circuit with filter configuration
First Claim
1. A tuning circuit, comprising:
- a slave filter block that receives a first control signal and outputs a second control signal; and
a master filter block that receives first and second prescribed reference signals and outputs the first control signal to the slave filter block, wherein the master filter block comprises;
a polyphase filter that receives the first control signal, a first rectifier coupled to the polyphase filter, a second rectifier coupled to the polyphase filter, and a converter coupled to the first and second rectifiers that outputs the first control signal.
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Abstract
A tuning circuit for an RF communications system and method includes a master block that outputs a control signal to a slave block. The master block can include a first filter having a high pass filter and a low pass filter that each receive the control signal, a first rectifier coupled to the high pass filter, a second rectifier coupled to the low pass filter, and a converter coupled to the first and second rectifiers that outputs the control signal. The first filter is preferably a gm-C poly-phase filter. Output signals of the gm-C poly-phase filter include high and low pass filtering signals resulting from similarly configured circuits so that the output signals have the same electrical characteristics, which results in an increased accuracy, for example, in a cut-off frequency.
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Citations
29 Claims
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1. A tuning circuit, comprising:
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a slave filter block that receives a first control signal and outputs a second control signal; and
a master filter block that receives first and second prescribed reference signals and outputs the first control signal to the slave filter block, wherein the master filter block comprises;
a polyphase filter that receives the first control signal, a first rectifier coupled to the polyphase filter, a second rectifier coupled to the polyphase filter, and a converter coupled to the first and second rectifiers that outputs the first control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A tuning circuit, comprising:
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a slave filter block having a cut-off frequency that receives a first control signal and outputs a second control signal; and
a master filter block comprising a polyphase filter that receives first and second prescribed reference signals and outputs the first control signal to the slave filter block, wherein the second prescribed reference signal has a frequency approximately equal to the cut-off frequency of said slave filter block. - View Dependent Claims (11, 12, 13)
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14. A tuning circuit, comprising:
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a slave filter block having a cut-off frequency that receives a first control signal and outputs a second control signal; and
a master filter block that receives the first control signal, said master filter block comprising a high pass filter and a low pass filter, said master filter block adapted to receive first and second prescribed reference signals and output the first control signal to the slave filter block, wherein the second prescribed reference signal has a frequency approximately equal to the cut-off frequency of said slave filter block. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for tuning a master-slave tuning circuit, comprising:
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slave filtering a first control signal to output a second control signal; and
master filtering first and second reference signals to output the first control signal for said slave filtering, wherein said master filtering comprises, high pass filtering the second reference signal using a first polyphase filter based on the first control signal, and low pass filtering the second reference signal using a second polyphase filter based on the first control signal, wherein the second prescribed reference signal has a frequency approximately equal to a cut-off frequency of said slave filtering. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification