JPS6424626A - Digital control type variable capacitor device - Google Patents
Digital control type variable capacitor deviceInfo
- Publication number
- JPS6424626A JPS6424626A JP18178787A JP18178787A JPS6424626A JP S6424626 A JPS6424626 A JP S6424626A JP 18178787 A JP18178787 A JP 18178787A JP 18178787 A JP18178787 A JP 18178787A JP S6424626 A JPS6424626 A JP S6424626A
- Authority
- JP
- Japan
- Prior art keywords
- gate
- supplied
- signal
- connecting point
- capacitance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To prevent the fluctuation in capacitance due to leakage of a signal by using a 1st driving circuit and a 2nd driving circuit outputting signals opposite in polarity to each other from a control circuit so as to drive a 1st semiconductor switch and a 2nd semiconductor switch element each having a complementary switching characteristic. CONSTITUTION:A voltage at a cross point between the output R of a NOR circuit 17 and the output S of an inverter 18, through the proper selection of the size of transistors(TRs), and the change from 'L' to 'H' of a signal R supplied to the gate 7 of an N-channel TR 4 of a switching circuit is supplied to a connecting point P through the coupling capacitance and the parasitic capacitance between between the gate 7 and the source 8 and between the gate 7 and the drain 6, and the change from 'H' to 'L' of a signal S supplied to the gate 10 of a P-channel TR 5 is supplied to the connecting point P through a coupling capacitance and a parasitic capacitance, etc., between the gate 10 and the drain 9 and between the gate 10 and the source 11, and they are cancelled together thereby preventing a voltage U at the connecting point P from being affected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18178787A JPS6424626A (en) | 1987-07-21 | 1987-07-21 | Digital control type variable capacitor device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18178787A JPS6424626A (en) | 1987-07-21 | 1987-07-21 | Digital control type variable capacitor device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6424626A true JPS6424626A (en) | 1989-01-26 |
Family
ID=16106865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18178787A Pending JPS6424626A (en) | 1987-07-21 | 1987-07-21 | Digital control type variable capacitor device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6424626A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6471323A (en) * | 1987-09-11 | 1989-03-16 | Fujitsu Ltd | Analog switching circuit |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5740969A (en) * | 1980-08-25 | 1982-03-06 | Toshiba Corp | Complementary mos inverter |
JPS5899033A (en) * | 1981-12-09 | 1983-06-13 | Nec Corp | Integrated circuit device |
JPS58186224A (en) * | 1982-04-24 | 1983-10-31 | Toshiba Corp | Cmos analog switch |
JPS60160651A (en) * | 1984-01-31 | 1985-08-22 | Hitachi Ltd | Semiconductor device |
-
1987
- 1987-07-21 JP JP18178787A patent/JPS6424626A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5740969A (en) * | 1980-08-25 | 1982-03-06 | Toshiba Corp | Complementary mos inverter |
JPS5899033A (en) * | 1981-12-09 | 1983-06-13 | Nec Corp | Integrated circuit device |
JPS58186224A (en) * | 1982-04-24 | 1983-10-31 | Toshiba Corp | Cmos analog switch |
JPS60160651A (en) * | 1984-01-31 | 1985-08-22 | Hitachi Ltd | Semiconductor device |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6471323A (en) * | 1987-09-11 | 1989-03-16 | Fujitsu Ltd | Analog switching circuit |
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