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US 11,418,163 B1Granted
Constant-bandwidth linear variable gain amplifier
AssigneeMarvell Asia Pte Ltd
InventorsSagar Ray, Jeffrey Wang, Karthik Raviprakash
Life of this patent
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Abstract
The present invention is directed electrical circuits. According to a specific embodiment, the present invention provides a variable gain amplifier that includes a first switch, which includes drain terminal coupled to an inductor. A second switch is configured in parallel to the inductor, and the resistance value of the second switch is adjustable in response to a control signal. There are other embodiments as well.
Claims16
A variable gain amplifier comprising:
- a first switch comprising a first gate terminal and a first drain terminal, the first gate terminal being coupled to a first input voltage of a differential input signal;
- a second switch comprising a second gate terminal and a second drain terminal, the second gate terminal being coupled to a second input voltage of the differential input signal;
- a first output terminal coupled to the first drain terminal;
- a second output terminal coupled to the second drain terminal;
- a first inductor coupled to the first drain terminal;
- a second inductor coupled to the second drain terminal;
- a third switch comprising a third gate terminal and coupled in parallel with the first inductor;
- a fourth switch comprising a fourth gate terminal and coupled in parallel with the second inductor, the third switch and the fourth switch receiving, from a control module, a bandwidth control signal that varies a bandwidth of the variable gain amplifier;
- and
- a fifth switch that receives, from the control module, a gain control signal that varies a gain of the variable gain amplifier,
- the first switch and the second switch being configured to output, via the first output terminal and the second output terminal, a differential output signal in accordance with (i) the gain control signal and (ii) the bandwidth control signal.
8 more elements
A variable gain amplifier comprising:
- a first switch comprising a first base terminal and a first collector terminal, the first base terminal being coupled to a first input voltage;
- a second switch comprising a second base terminal and a second collector terminal, the second base terminal being coupled to a second input voltage;
- a first output terminal coupled to the first collector terminal;
- a second output terminal coupled to the second collector terminal;
- a first inductor coupled to the first collector terminal;
- a second inductor coupled to the second collector terminal;
- a third switch comprising a first gate terminal and configured in parallel to the first inductor;
- a fourth switch comprising a second gate terminal and configured in parallel to the second inductor, the third switch and the fourth switch configured to receive, from a control module, a bandwidth control signal that varies a bandwidth of the variable gain amplifier;
- and
- a fifth switch configured to receive, from the control module, a gain control signal that varies a gain of the variable gain amplifier,
- the first switch and the second switch being configured to output, via the first output terminal and the second output terminal, a differential output signal in accordance with (i) the gain control signal and (ii) the bandwidth control signal.
8 more elements
A receiver apparatus comprising:
- an input terminal for receiving incoming data signals;
- a variable gain amplifier coupled to the input terminal, the variable gain amplifier comprising a first switch and an inductor, the first switch being coupled to the input terminal, the first switch comprising (i) a source terminal coupled to a variable resistor and (ii) a drain terminal coupled to the inductor, the variable resistor being configured to receive, from a control module, a first control signal that varies a gain of the variable gain amplifier, the variable gain amplifier further comprising a second switch coupled in parallel with the inductor, the second switch being configured to receive, from the control module, a second control signal that varies a bandwidth of the variable gain amplifier;
- and
- an analog to digital converter (ADC) configured to generate a digital signal based on the incoming data signal, the ADC being coupled to the drain terminal.
1 more element
Dependencies are inferred from the claim text.