capacitive sensor interface circuit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 12, 1998
Grant Date -
N/A
app pub date -
Oct 28, 1996
filing date -
Mar 29, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a switched-capacitor type interface circuit connected to a capacitive sensor having two capacitors (C1, C2) whose value is variable, the interface circuit includes an operational amplifier (A1) with an output terminal and an inverting input terminal between which a feedback/sampling capacitor (C3) is connected, and a holding capacitor (C4) connected between the operational amplifier (A1) and a reference voltage source. The capacitors (C1, C2, C3) have one ends connected to the inverting input terminal of the operational amplifier (A1). The other ends of the capacitors (C1, C2) are connected to a power source and the capacitor (C3) is concurrently short-circuited depending upon predetermined timing, and the other ends of the and capacitors (C1, C2) and the output terminal of the operational amplifier (A1) are respectively connected to a non-inverting input terminal of the operational amplifier (A1) after the elapse of a predetermined time from the predetermined timing.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully