Buffer amplifier and trans-impedance amplifier including the same
AssigneeElectronics and Telecommunications Research Instit
InventorsYoung Ho Kim, Sang Soo Lee
Life of this patent
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Abstract
Provided is a buffer amplifier. The buffer amplifier includes: a replica bias unit dividing an internal power voltage received from an internal power node to generate a bias voltage; an input unit including a first differential amplifier comparing a first differential input signal with the bias voltage to output a first internal signal and a second differential amplifier comparing a second differential input signal with the bias voltage to output a second internal signal; and an output unit including a third differential amplifier comparing the first internal signal with the second internal signal to output a first differential output signal and a second differential output signal.
Claims16
A buffer amplifier comprising:
- a replica bias unit dividing an internal power voltage received from an internal power node to generate a bias voltage;
- an input unit including a first differential amplifier comparing a first differential input signal with the bias voltage to output a first internal signal and a second differential amplifier comparing a second differential input signal with the bias voltage to output a second internal signal;
- and
- an output unit including a third differential amplifier comparing the first internal signal with the second internal signal to output a first differential output signal and a second differential output signal,
- wherein the first differential amplifier and the second differential amplifier drive the first internal signal and the second internal signal, respectively, by using an external power voltage received from an external power node separated from the internal power node;
- and the third differential amplifier drives the first differential output signal and the second differential output signal by using the external power voltage, and
- wherein the first to third differential amplifiers operate on the basis of current sources operating in response to a control voltage.
A trans-impedance amplifier comprising:
- a trans-impedance amplification device configured to convert a current signal received from an outside into a voltage signal and amplify the converted voltage signal;
- a single to differential (S2D) amplifier configured to convert the voltage signal into a first differential signal and a second differential signal and amplify the converted signals;
- a voltage amplifier configured to remove direct current (DC) components of the first differential signal and the second differential signal in response to a first DC-offset cancellation signal and a second DC-offset cancellation signal and amplifying the first differential signal and the second differential signal as a first differential input signal and a second differential input signal;
- and
- a buffer configured to output the first differential input signal and the second differential input signal as a first differential output signal and a second differential output signal,
- wherein the buffer comprises:
- a replica bias unit dividing an internal power voltage received from an internal power node to generate a bias voltage;
- an input unit including a first differential amplifier comparing the first differential input signal with the bias voltage to output a first internal signal and a second differential amplifier comparing the second differential input signal with the bias voltage to output a second internal signal;
- and
- an output unit including a third differential amplifier comparing the first internal signal with the second internal signal to output the first differential output signal and the second differential output signal,
- wherein the first differential amplifier and the second differential amplifier drive the first internal signal and the second internal signal, respectively, by using an external power voltage received from an external power node separated from the internal power node;
- and the third differential amplifier drives the first differential output signal and the second differential output signal by using the external power voltage.
Dependencies are inferred from the claim text.