Active differential resistors with reduced noise
AssigneeLinear Technology Corporation
InventorMichael Thomas Engelhardt
Life of this patent
Estimating the term…
Abstract
A method and system of providing an active differential resistor. The active differential resistor includes a diode having a first node and a second node. There is a capacitor coupled in series between the first node of the diode and an input of the active differential resistor. There is a current source coupled across the first node and the second node of the diode and configured to forward bias the diode such that a Johnson-Nyquist noise of the active differential resistor is replaced by a shot noise.
Claims23
An active differential resistor, comprising:
- an input node and an output node operative to provide a differential resistance;
- a diode having a first node and a second node;
- a capacitor coupled in series between the first node of the diode and the input node;
- and
- a current source coupled across the first node and the second node of the diode and configured to forward bias the diode such that a Johnson-Nyquist noise of the active differential resistor is replaced by a shot noise.
A method of providing an active differential resistance between an input node and an output node, comprising:
- forward biasing a diode coupled between the input node and the output node such that a Johnson-Nyquist noise of the active differential resistance is replaced by a shot noise;
- and
- coupling a capacitor between the input node and a first node of the diode.
An active differential resistor, comprising:
- an input node and an output node operative to provide a differential resistance;
- a means of providing a unidirectional current having a first node and a second node;
- a capacitor coupled in series between the first node of the means of providing the unidirectional current and the input node;
- and
- a second means of providing a current coupled across the first node and the second node of the means of providing the unidirectional current, and configured to forward bias the means of providing the unidirectional current, such that a Johnson-Nyquist noise of the active differential resistor is replaced by a shot noise.
Dependencies are inferred from the claim text.