Title:
COMPARATOR AND OSCILLATOR CIRCUIT USING SAID COMPARATOR
Document Type and Number:
WIPO Patent Application WO/2019/116764
Kind Code:
A1
Abstract:
The purpose of the present invention is to control, in an oscillator circuit using a comparator, the charging/discharging of a mirror capacitance between gate and drain of a MOSFET used as an amplifier in a gain section of the comparator and a gate capacitance of this MOSFET and thereby enable, even when a control signal having a relatively high frequency is input from the outside, the comparator output to follow the control signal. An oscillator circuit 1d using a comparator CMP having a differential section 2 and a gain section 3 has: a charge/discharge control section 4d for controlling the charging/discharging of a mirror capacitance between gate and drain and a gate capacitance of a MOSFET (N2); and output control sections 6d, 7 for controlling an output of the gain section. The output control sections have: an inverter INV5d whereto is connected one of input ends of the differential section and whereto is input a control signal; a logic circuit INV6d, NOR 2 whereto is input an output of the inverter and the output of the gain section; a transistor N8a; and capacitance C2 connected to the input and output ends of the logic circuit.
More Like This:
| JPH0493774 | CHOPPER TYPE COMPARATOR |
Inventors:
NAKAGOMI KENJI (JP)
Application Number:
PCT/JP2018/040507
Publication Date:
June 20, 2019
Filing Date:
October 31, 2018
Export Citation:
Assignee:
FUJI ELECTRIC CO LTD (JP)
International Classes:
H03K5/08; H03K3/353
Foreign References:
| JP2001267893A | 2001-09-28 | |||
| JPH11242060A | 1999-09-07 | |||
| JPH0722923A | 1995-01-24 | |||
| JPH08288825A | 1996-11-01 | |||
| US4479097A | 1984-10-23 |
Attorney, Agent or Firm:
OKUYAMA, Shoichi et al. (JP)
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