Gain control circuit and electronic volume circuit
AssigneeFujitsu Semiconductor Limited
InventorToshiya Kamibayashi
Life of this patent
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Abstract
A gain control circuit includes a comparator that compares an input gain value with a count value to generate a comparison result signal, a counter that counts up or counts down the count value in accordance with the comparison result signal, and a gain modulator circuit that modulates the count value to generate a gain control signal which changes in a time-divided manner. The gain modulator circuit modulates the count value so that a gain obtained by time-averaging a gain corresponding to the gain control signal matches a gain based on the count value.
Claims11
A gain control circuit comprising:
- a comparator configured to compare an input gain value with a count value to generate a comparison result signal;
- a counter configured to increase or decrease the count value in accordance with the comparison result signal;
- and
- a gain modulator circuit configured to modulate the count value to generate a gain control signal which changes in a time-divided manner,
- wherein the gain modulator circuit is configured to modulate the count value so that a gain obtained by time-averaging a gain corresponding to the gain control signal matches a gain based on the count value.
An electronic volume circuit comprising:
- an amplifier circuit that is configured to adjust a gain of an input signal based on a gain control signal;
- and
- a gain control circuit that is configured to supply the gain control signal to the amplifier circuit,
- wherein the gain control circuit includes:
- a comparator that is configured to compare an input gain value with a count value to generate a comparison result signal,
- a counter that is configured to count in accordance with the comparison result signal, and
- a gain modulator circuit that is configured to modulate the count value to generate a gain control signal that changes in a time-divided manner,
- wherein the gain modulator circuit is configured to modulate the count value so that a gain obtained by time-averaging a gain corresponding to the gain control signal matches a gain based on the count value.
Dependencies are inferred from the claim text.