Bias voltage and constant current supply circuit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 28, 1989
Grant Date -
N/A
app pub date -
Oct 15, 1987
filing date -
Oct 15, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit for providing a constant current and a constant bias voltage is described. The circuit includes two paths coupled between a positive voltage supply +V.sub.S and a negative voltage supply -V.sub.S. Each path inlcudes a Zener diode and a enhancement mode field effect transistor (FET) device (the FET device being coupled in a diode configuration) which are connected in series. Each path of the circuit further includes an FET device and an associated resistor combination, coupled in series with the Zener diode and the diode-coupled FET device. The FET device and the associated resistor function as a current source component. A gate terminal of each FET device of the current source component is coupled across the Zener diode and the diode-coupled FET device of the other circuit path. This cross-coupling between the two paths provides compensation, in addition to that provided by the Zener diode characteristics, for variations in circuit parameters, such as changes in the voltage supplies, thereby permitting a stable bias voltage to be generated.
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