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
A pre-amplifier comprising:
- a first stage including:
- a feedback amplifier circuit configured to control an output voltage swing of an 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
- a second stage including:
- a buffer circuit configured to amplify an output signal of the output differential signal pair to generate a buffered output signal configured to drive a resistive load included in a gain module.
An amplifier comprising:
- a feedback amplifier circuit configured to control an output voltage swing of an 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 pair of capacitors, the input amplifier circuit configured to output the output differential signal pair based on the input differential signal pair and the bias current;
- a DC bias module coupled between the pair of capacitors and the input amplifier circuit and configured to control a high pass filter frequency of the amplifier;
- 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.
Dependencies are inferred from the claim text.