SIGNAL TRANSMITTING CIRCUIT

Title:

SIGNAL TRANSMITTING CIRCUIT

Document Type and Number:

Japanese Patent JPS59175209

Kind Code:

A

Abstract:

PURPOSE: To obtain a variable resistance with low power consumption by varying the frequency or duty ratio of a clock pulse of a switched capacitor.

CONSTITUTION: The switched capacitor is connected between an input terminal T1 and the positive-phase input terminal of an operational amplifier 1, and switches S1 and S2 of the switched capacitor are turned on and off by the output signal of a voltage-controlled oscillator 2 and the output signal ' of an inverter 3 respectively. The charging current of the capacitor C2 is determined by the frequency or duty ratio of the clock, so the switched capacitor operates equivalently as a resistance. For this purpose, a voltage VC applied to the voltage-controlled oscillator 2 is controlled to obtain the equivalent variable resistance by varying the frequency of the clock pulses.

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Inventors:

WATANABE KAZUO
SATOU TETSUO

Application Number:

JP4882583A

Publication Date:

October 04, 1984

Filing Date:

March 25, 1983

Export Citation:

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Assignee:

HITACHI LTD

International Classes:

G11B5/02; G11B5/035; G11B20/24; H03G3/10; H03H19/00; H04B3/04; (IPC1-7): H03G3/02; H03H19/00; H04B3/04

Attorney, Agent or Firm:

Katsuo Ogawa (1 person outside)

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Next Patent: JPS59175210