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US 12,119,789 B2Granted
Variable gain power amplifiers
AssigneeTexas Instruments Incorporated
InventorSudipto Chakraborty
Life of this patent
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Abstract
A variable-gain power amplifying technique includes generating, with a network of one or more reactive components included in an oscillator, a first oscillating signal, and outputting, via one or more taps included in the network of the reactive components, a second oscillating signal. The second oscillating signal has a magnitude that is proportional to and less than the first oscillating signal. The power amplifying technique further includes selecting one of the first and second oscillating signals to use for generating a power-amplified output signal, and amplifying the selected one of the first and second oscillating signals to generate the power-amplified output signal.
Claims19
An integrated circuit comprising:
- a first coarse gain control circuit that includes:
- a first coarse gain input;
- a first coarse gain output;
- a first coarse gain control input;
- and
- a first set of passive devices;
- a second coarse gain control circuit that includes:
- a second coarse gain input;
- a second coarse gain output;
- a second coarse gain control input;
- and
- a second set of passive devices;
- a first amplifier stage that includes:
- a first amplifier that includes a first amplifier gain control input, a first amplifier input coupled to the first coarse gain output, and a first amplifier output;
- and
- a second amplifier that includes a second amplifier gain control input, a second amplifier input coupled to the second coarse gain output, and a second amplifier output;
- a second amplifier stage that includes:
- a third amplifier that includes a third amplifier gain control input, a third amplifier input coupled to the first amplifier output, and a third amplifier output;
- and
- a fourth amplifier that includes a fourth amplifier gain control input, a fourth amplifier input coupled to the second amplifier output, and a fourth amplifier output,
- wherein the first set of passive devices includes one of a plurality of inductors coupled in series, and a network of capacitors.
18 more elements
A transmitter circuit comprising:
- an oscillator that includes an oscillator output configured to output a single output signal;
- a first coarse gain control circuit that includes:
- a first set of passive devices;
- a first coarse gain circuit input coupled to the oscillator output;
- a first gain control input to receive a first gain control signal;
- and
- a first coarse gain circuit output configured to output a first output signal;
- wherein the first coarse gain control circuit is configured to adjust the single output signal based on the first gain control signal;
- a second coarse gain control circuit that includes:
- a second set of passive devices;
- a second coarse gain circuit input coupled to the oscillator output;
- a second gain control input configured to receive a first gain control signal;
- and
- a second coarse gain circuit output configured to output a first output signal;
- wherein the second coarse gain control circuit is configured to adjust the single output signal based on the first gain control signal;
- and
- a first amplifier stage that includes:
- a first amplifier that includes a first amplifier input coupled to the first coarse gain circuit output, a first amplifier output, and a third gain control input;
- a second amplifier that includes a second amplifier input coupled to the second coarse gain circuit output, a second amplifier output, and a fourth gain control input;
- and
- a first voltage source that includes a first voltage input configured to receive a second gain control signal, and a first voltage output coupled to the third gain control input and the fourth gain control input;
- wherein the first set of passive devices comprises a plurality of inductors coupled in series, and
- wherein the first set of passive devices is configured to adjust the single output signal to produce the first output signal.
20 more elements
A transmitter circuit comprising:
- an oscillator that includes an oscillator output configured to output a single output signal,
- a first coarse gain control circuit that includes:
- a first set of passive devices;
- a first coarse gain circuit input coupled to the oscillator output;
- a first gain control input to receive a first gain control signal;
- and
- a first coarse gain circuit output configured to output a first output signal;
- wherein the first coarse gain control circuit is configured to adjust the single output signal based on the first gain control signal;
- a second coarse gain control circuit that includes:
- a second set of passive devices;
- a second coarse gain circuit input coupled to the oscillator output;
- a second gain control input configured to receive a first gain control signal;
- and
- a second coarse gain circuit output configured to output a first output signal;
- wherein the second coarse gain control circuit is configured to adjust the single output signal based on the first gain control signal;
- and
- a first amplifier stage that includes:
- a first amplifier that includes a first amplifier input coupled to the first coarse gain circuit output, a first amplifier output, and a third gain control input;
- a second amplifier that includes a second amplifier input coupled to the second coarse gain circuit output, a second amplifier output, and a fourth gain control input;
- and
- a first voltage source that includes a first voltage input configured to receive a second gain control signal, and a first voltage output coupled to the third gain control input and the fourth gain control input;
- wherein the first set of passive devices is configured to adjust the single output signal to produce the first output signal, and
- wherein the second set of passive devices includes a plurality of capacitors.
20 more elements
Dependencies are inferred from the claim text.