Current control method and application thereof
AssigneeSanyo Electric Co., Ltd.
InventorsTakafumi Nakamori, Atsushi Wada
Life of this patent
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Abstract
A current supply circuit supplies a bias current to operational amplifiers which constitute a pipelined AD converter. A current switching circuit switches between output currents in response to a current control signal from current control means, thereby switching between currents to be supplied from a bias circuit to the operational amplifiers via transistors. A sufficiently large current enough for the amplifiers to operate at a high frequency is supplied, while the current is switched to a lower supply current for the amplifier to operate at lower frequencies.
Claims20
A current control method comprising:
- varying a value of a current required for an amplifier to operate, in response to an operational frequency of said amplifier when said current is supplied to said amplifier.
A current supply circuit for supplying a current required for an amplifier to operate, comprising:
- current switching means which receives a current control signal delivered responsive of switching between operational frequencies of said amplifier to switch between currents to be supplied to said amplifier.
A semiconductor circuit comprising:
- a plurality of amplifiers;
- and
- current switching means which receives a current control signal delivered responsive of switching between operational frequencies of said amplifier to switch between currents to be supplied to said plurality of amplifiers.
The semiconductor circuit according to claim S, wherein
- said current switching means is provided corresponding to each of said plurality of amplifiers to switch between currents to be supplied to an amplifier connected to itself.
An analog-to-digital converter comprising:
- a plurality of sub-AD converter circuits connected in series;
- an amplifier which is interposed between sub-AD converter circuits to amplify an input signal to a sub-AD converter circuit at the next stage;
- and
- current switching means which receives a current control signal delivered responsive of switching between operational frequencies of said amplifier to switch between currents to be supplied to said amplifier.
An electronic device comprising:
- a plurality of amplifiers;
- current control means which controls a current to be supplied to said amplifier responsive of switching between operational frequencies of said amplifier, and
- current switching means which receives a current control signal delivered by said current control means to switch between currents to be supplied to said plurality of amplifiers.
An electronic device comprising:
- an AD converter which comprises a plurality of sub-AD converter circuits connected in series, an amplifier which is interposed between sub-AD converter circuits to amplify an input signal to a sub-AD converter circuit at the next stage, and current switching means which switches currents to be supplied to said amplifier;
- frequency control means which switches operational frequency of said amplifier;
- and
- current control means which transmits a current control signal to said current switching means for controlling a current to be supplied to said amplifier responsive of switching between operational frequencies of said amplifier,
- wherein, when said AD converter converts input signals of a plurality of series in a time division manner, said frequency control means switches the operational frequency responsive to the number of said series.
A receiver, comprising:
- a plurality of antennas;
- an AD converter which comprises a plurality of sub-AD converter circuits connected in series, an amplifier which is interposed between sub-AD converter circuits to amplify an input signal to a sub-AD converter circuit at the next stage, and current switching means which switches currents to be supplied to said amplifier;
- frequency control means which switches operational frequency of said amplifier;
- and
- current control means which transmits a current control signal to said current switching means for controlling a current to be supplied to said amplifier responsive of switching between operational frequencies of said amplifier,
- wherein, when said AD converter converts input signals of a plurality of series, which are received by said plurality of antennas, in a time division manner, said frequency control means switches the operational frequency responsive to the number of said series.
Dependencies are inferred from the claim text.