Low noise differential amplifier
AssigneeSemiconductor Components Industries, LLC
InventorsAbdullah Ahmed, Jonas Weiland
Life of this patent
Estimating the term…
Abstract
In one general aspect, an amplifier can include an input amplifier circuit configured to receive a bias current and receive, as an input, a signal pair connected differentially to the input amplifier circuit, the input amplifier circuit configured to output a differential output signal pair based on the received differential input signal pair, a feedback amplifier circuit configured to receive an average of the differential output signal pair and configured to provide a bias setting output for controlling the bias current, and an output buffer circuit configured to buffer the differential output signal pair, the buffering resulting in a buffered differential output signal pair capable of driving a resistive load.
Claims20
An amplifier comprising:
- a feedback amplifier circuit configured to control an output voltage swing of a output differential signal pair in relation to a bias current by providing a constant output voltage signal gain for the output differential signal pair;
- an input amplifier circuit configured to receive the bias current and configured to receive, as an input, an input differential signal pair connected differentially to the input amplifier circuit through a blocking capacitor, the input amplifier circuit configured to output the output differential signal pair based on the input differential signal pair and the bias current, the input amplifier circuit including a transistor and resistor block controllable to switch output load resistors to the input amplifier circuit;
- and
- an output buffer including a first buffer circuit and a second buffer circuit, the first buffer circuit configured to amplify a first output signal of the output differential signal pair to generate a first buffered output signal configured to drive a first resistive load, the second buffer circuit configured to amplify a second output signal of the output differential signal pair to generate a second buffered output signal configured to drive a second resistive load.
A method comprising:
- receiving, by an input amplifier circuit included in an amplifier, an input differential signal pair and a bias current;
- switching, by a transistor and resistor block, output load resistors to the input amplifier circuit;
- outputting, by the input amplifier circuit, an output differential signal pair based on the received input differential signal pair and the received bias current;
- receiving, by a feedback amplifier circuit included in the amplifier, a combination of the signals of the output differential signal pair;
- and
- outputting, by the feedback amplifier circuit, a signal for controlling the bias current.
An amplifier comprising:
- an input amplifier circuit configured to receive a bias current and receive, as an input, a differential input signal pair connected differentially to the input amplifier circuit, the input amplifier circuit configured to output a differential output signal pair based on the received differential input signal pair, the input amplifier circuit including a transistor and resistor block controllable to switch output load resistors to the input amplifier circuit;
- a feedback amplifier circuit configured to receive an average of the differential output signal pair and configured to provide a bias setting output for controlling the bias current;
- and
- an output buffer circuit configured to buffer the differential output signal pair, the buffering resulting in a buffered differential output signal pair capable of driving a resistive load.
Dependencies are inferred from the claim text.