Title:
METHOD OF CHANGING OVER CAPACITOR OF CHANGEOVER CAPACITOR CIRCUIT
Document Type and Number:
Japanese Patent JPH057131
Kind Code:
A
Abstract:
PURPOSE: To reduce signal depending distortion generated in a switch process by directly and alternately switching first and second switches from one contact point in each switch to the other contact point. CONSTITUTION: In an initial state, a capacitor 13 is connected between a first signal source 14 and a switch 12 contact point D (ground). Then, the switch 12 changes over the ground contact point D to the virtual ground input of an amplifier 16. When the switch 12 completes the operation, the switch 11 changes over the capacitor 13 to a second signal source 15. Then, the switch 12 returns to the ground contact point D and the switch cycle of a switch capacitor circuit completes. Either switch 11 or 12 is not in an intermediate (floating) state while the other switch is in the middle of operation. For reducing signal depending distortion by the switches 11 and 12, the respective switches 11 and 12 alternately operate so that switching completes from one contact point to the other contact point before the other switch operates.
Inventors:
JIYOHASAN HAAMAN FUITSUSHIYAA
Application Number:
JP1678991A
Publication Date:
January 14, 1993
Filing Date:
January 18, 1991
Export Citation:
Assignee:
AMERICAN TELEPHONE & TELEGRAPH
International Classes:
H03H19/00; H03K17/00; H01H9/54; (IPC1-7): H01H9/54; H03H19/00; H03K17/00
Domestic Patent References:
| JPS6449311A | 1989-02-23 | |||
| JPS60140478A | 1985-07-25 |
Attorney, Agent or Firm:
Hirofumi Mimata
Next Patent: AUTOMATIC FREQUENCY CONTROL CIRCUIT