Back to results
US 4,354,162 AGranted
Wide dynamic range control amplifier with offset correction
AssigneeNational Semiconductor Corporation
InventorJohn W. Wright
Life of this patent
Estimating the term…
Abstract
A unity gain amplifier circuit has a control characteristic which permits a variation of the high frequency roll off as a function of a control voltage. Means are provided to prevent a change of output voltage resulting from the control voltage variation.
Claims4
A control amplifier circuit having a frequency response that can be varied in response to a control voltage, said circuit comprising:
- a variable transconductance amplifier having a differential input;
- means responsive to said control voltage for varying the current in said transconductance amplifier;
- a pair of back to back diodes coupled in series across said differential input;
- means for forward biasing said diodes whereby the linearity of said amplifier is enhanced;
- negative feedback means coupled to the noninverting input of said amplifier to limit the gain thereof;
- and
- a resistor coupled in series with the inverting input of said amplifier whereby the offset introduced into said amplifier by said means for varying is compensated.
4 more elements
Dependencies are inferred from the claim text.