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US 2004/0061635 A1Published application
Stepwise zero-data-detection mute circuit
AssigneeKabushiki Kaisha Toshiba
InventorsToshikazu Oda, Mitsuru Nagata, Hiroyuki Eguchi
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AssigneeKabushiki Kaisha Toshiba
InventorsToshikazu Oda, Mitsuru Nagata, Hiroyuki Eguchi
Estimating the term…
A variable resistance device is disclosed, which comprises a first variable resistance circuit and analog switches, a second variable resistance circuit including series-connected first and second resistors, one terminal of the first resistor connected to one terminal of the second resistor and the other terminal connected to one terminal of the first variable resistance circuit, a series-resistor circuit one terminal of which is connected to the other terminal of the second resistor, analog switches connected between the other terminal of the first resistor and nodes of respective resistors of the series-resistor circuit, an analog switch connected between the other terminal of the series-resistor circuit and a node of the first and second resistors, an analog switch connected between a node of the resistors of the series-resistor circuit and the node of the first and second resistors, and a short-circuiting analog switch connected between the first and second variable resistance circuits.
A variable resistance device comprising:
A zero-data-detection mute circuit of an output section of a one-bit D/A converter in which a multibit digital signal is converted into a one-bit signal via a modulator, the one-bit signal is outputted in a form of analog signal via an inverting type amplifier of an analog low-pass filter, a counter is operated when detecting that the multibit digital signals are all zero for a predetermined time period to decrease stepwise a resistance of a feedback resistor circuit of the inverting type amplifier of the analog low-pass filter and finally make a short-circuit both terminals of the feedback resistor circuit according to an output of the counter to fix an output of the inverting type amplifier to a reference potential, the feedback resistor circuit comprising:
A variable resistance device comprising:
A zero-data-detection mute circuit of an output section of a one-bit D/A converter in which a multibit digital signal is converted into a one-bit signal via a modulator, the one-bit signal is outputted in a form of analog signal via an inverting type amplifier of an analog low-pass filter, a counter is operated when detecting that the multibit digital signals are all zero for a predetermined time period to decrease stepwise a resistance of a feedback resistor circuit of the inverting type amplifier of the analog low-pass filter and finally make a short-circuit both terminals of the feedback resistor circuit according to an output of the counter to fix an output of the inverting type amplifier to a reference potential, the feedback resistor circuit comprising:
A zero-data-detection mute circuit of an output section of a one-bit D/A converter, comprising:
A zero-data-detection mute circuit of an output section of a one-bit D/A converter, comprising:
Dependencies are inferred from the claim text.