Transimpedance amplifier
First Claim
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1. A transimpendance amplifier comprising:
- a multistage amplifier comprising differential output terminals to provide an output signal in response to an input signal and an input stage transistor having a gate terminal to receive the input signal from a photodiode; and
a feedback transistor comprising a gate terminal coupled to one of the differential output terminals, and one of a source terminal and a drain terminal coupled to the gate terminal of the input stage transistor, wherein the feedback transistor is selected to maintain an input voltage at the gate terminal of the input stage transistor to maintain a set or predetermined transconductance between the gate terminal of the input stage transistor and the differential output terminals.
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Abstract
Disclosed is a transimpedance amplifier comprising a multistage amplifier and a feedback circuit coupled between a single ended input terminal and one of a plurality of differential output terminals of the multistage amplifier. The feedback circuit may control an input voltage at the single input terminal to substantially maintain a set or predetermined transconductance between the single ended input terminal and the differential output terminals.
45 Citations
37 Claims
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1. A transimpendance amplifier comprising:
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a multistage amplifier comprising differential output terminals to provide an output signal in response to an input signal and an input stage transistor having a gate terminal to receive the input signal from a photodiode; and
a feedback transistor comprising a gate terminal coupled to one of the differential output terminals, and one of a source terminal and a drain terminal coupled to the gate terminal of the input stage transistor, wherein the feedback transistor is selected to maintain an input voltage at the gate terminal of the input stage transistor to maintain a set or predetermined transconductance between the gate terminal of the input stage transistor and the differential output terminals. - View Dependent Claims (2)
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3. A transimpendance amplifier comprising:
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a multistage amplifier comprising differential output terminals and a single ended input terminal to receive an input signal from a photodiode;
a transistor comprising a gate terminal coupled to one of the differential output terminals, and one of a source terminal and a drain terminal coupled to the single ended input terminal; and
resistor coupled between the single ended input terminal and the one of a source terminal and drain terminal of the, and wherein the resistor comprises a resistance selected to maintain an input voltage at the single ended input to maintain a set or predetermined transconductance between the single ended input terminal and the differential output terminals.
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4. A transimpendance amplifier comprising:
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a multistage amplifier comprising differential output terminals to provide an output signal in response to an input signal and an input stage transistor having a gate terminal to receive the input signal from a photodiode; and
a feedback circuit coupled between the gate terminal of the input stage transistor and a differential output terminal to maintain an input voltage at the gate terminal of the input transistor to substantially maintain a set or predetermined transconductance between the gate terminal of the input stage transistor and the differential output terminals. - View Dependent Claims (5, 6, 7, 8)
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9. A system comprising:
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a photodiode;
a transimpedance amplifier coupled to the photodiode to provide a differential output signal;
a data recovery circuit to provide a serial data signal in response to the differential output signal;
a deserializer to provide a parallel data signal in response to the serial data signal, wherein the transimpedance amplifier comprises;
a multistage amplifier comprising differential output terminals to provide the differential output signal in response to an input signal and an input stage transistor having a gate terminal to receive the input signal from the photodiode; and
a feedback transistor comprising a gate terminal coupled to one of the differential output terminals, and one of a source terminal and a drain terminal coupled to the gate terminal of the input stage transistor, wherein the feedback transistor is selected to maintain an input voltage at the gate terminal of the input stage transistor to maintain a set or predetermined transconductance between the gate terminal of the input stage transistor and the differential output terminals. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A system comprising:
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a photodiode;
a transimpedance amplifier coupled to the photodiode to provide a differential output signal;
a data recovery circuit to provide a serial data signal in response to the differential output signal;
a deserializer to provide a parallel data signal in response to the serial data signal, wherein the transimpedance amplifier comprises;
a multistage amplifier comprising a single ended input terminal to receive an input signal from the photodiode and differential output terminals to provide the differential output signal;
a transistor comprising a gate terminal coupled to one of the differential output terminals, and one of a source terminal and a drain terminal coupled to the single ended input terminal; and
a resistor coupled between the single ended input terminal and the one of a source terminal and drain terminal of the transistor, and wherein the resistor comprises a resistance selected to maintain an input voltage at the single ended input to maintain a set or predetermined transconductance between the single ended input terminal and the differential output terminals. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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17. A system comprising:
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a photodiode;
a transimpedance amplifier coupled to the photodiode to provide a differential output signal;
a data recovery circuit to provide a serial data signal in response to the differential output signal; and
a deserializer to provide a parallel data signal in response to the serial data signal, wherein the transimpedance amplifier comprises;
a multistage amplifier comprising differential output terminals to provide an output signal in response to an input signal and an input stage transistor having a gate terminal to receive the input signal from the photodiode; and
a feedback circuit coupled between the gate terminal of the input stage transistor and a differential output terminal to maintain an input voltage at the gate terminal of the input stage transistor to substantially maintain a set or predetermined transconductance between the gate terminal of the input stage transistor and the differential output terminals. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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26. A method comprising:
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receiving an input signal from a photodiode at a gate terminal of an input stage transistor of a multistage amplifier;
providing a voltage of a pair of differential output terminals of the multistage amplifier to a gate terminal of a feedback transistor; and
providing to the gate terminal of the input stage transistor a current from one of a source terminal and a drain terminal of the feedback transistor, wherein the feedback transistor is selected to maintain an input voltage at the gate terminal of the input stage transistor to maintain a set or predetermined transconductance between the gate terminal of the input stage transistor and the differential output terminals. - View Dependent Claims (27)
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28. A method comprising:
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receiving an input signal from a photodiode at a single ended input terminal of a multistage amplifier;
providing a voltage of a pair of differential output terminals of the multistage amplifier to a gate terminal of a transistor;
providing to the single ended input terminal a current from one of a source terminal and a drain terminal of the transistor; and
coupling a resistance between the transistor and the single ended input terminal to maintain an input voltage at the single ended input to maintain a set or predetermined transconductance between the single ended input terminal and the differential output terminals.
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29. A method comprising:
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receiving an input signal from a photodiode at a gate terminal of an input stage transistor of a multistage amplifier; and
maintaining an input voltage at the single ended input terminal to substantially maintain a set or predetermined transconductance between the gate terminal of the input stage amplifier and the differential output terminals in response to a voltage at one of the differential output terminals. - View Dependent Claims (30, 31)
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Specification