Linear multi-stage transimpedance amplifier
AssigneeRF Micro Devices, Inc.
InventorKevin W. Kobayashi
Life of this patent
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Abstract
An apparatus comprising a first amplifier circuit, a detect circuit, a control circuit and a second amplifier circuit. The first amplifier circuit may be configured to generate an amplified signal in response to an input signal. The detect circuit may be configured to generate a feed-forward signal in response to the amplified signal. The control circuit may be configured to generate a dynamic control signal in response to the feed-forward signal. The second amplifier circuit may be configured to generate an output signal in response to (i) the amplified signal and (ii) the dynamic control signal. The control circuit may be configured to control a gain of the second amplifier circuit by adjusting a magnitude of the dynamic control signal.
Claims21
An apparatus comprising:
- a first amplifier circuit comprising a transimpedance amplifier (TIA) pre-amplifier circuit and configured to generate an amplified signal in response to an input signal;
- a detect circuit configured to generate a feed-forward signal in response to said amplified signal;
- a control circuit configured to generate a dynamic control signal in response to said feed-forward signal;
- and
- a second amplifier circuit configured to generate an output signal in response to (i) said amplified signal and (ii) said dynamic control signal, wherein said control circuit is configured to control a gain of said second amplifier circuit by adjusting a magnitude of said dynamic control signal.
An apparatus comprising:
- a first amplifier circuit configured to generate an amplified signal in response to an input signal;
- a detect circuit configured to generate a feed-forward signal in response to said amplified signal and configured to generate a feedback signal in response to said amplified signal;
- a control circuit configured to generate a dynamic control signal in response to said feed-forward signal;
- and
- a second amplifier circuit configured to generate an output signal in response to (i) said amplified signal and (ii) said dynamic control signal, wherein said control circuit is configured to control a gain of said second amplifier circuit by adjusting a magnitude of said dynamic control signal.
An apparatus comprising:
- a first amplifier circuit configured to generate an amplified signal in response to an input signal;
- a detect circuit configured to generate a feed-forward signal in response to said amplified signal;
- a control circuit configured to generate a dynamic control signal in response to said feed-forward signal;
- and
- a second amplifier circuit comprising a variable gain two-stage feedback amplifier (VGA) and configured to generate an output signal in response to (i) said amplified signal and (ii) said dynamic control signal, wherein said control circuit is configured to control a gain of said second amplifier circuit by adjusting a magnitude of said dynamic control signal.
Dependencies are inferred from the claim text.