Back to results
US 2013/0278292 A1Published application
Detector circuit
AssigneeFujitsu Semiconductor Limited
InventorHiroyuki NAKAMOTO
Life of this patent
Estimating the term…
Abstract
A detector circuit, has a first diode, to an anode of which an AC signal is input and to which a constant voltage is supplied, a second diode, to an anode of which the constant voltage is supplied, and a difference current generation circuit, which generates the difference current between a first current flowing in the first diode and a second current flowing in the second diode.
Claims20
A detector circuit, comprising:
- a first diode, to an anode of which an AC signal is input and to which a constant voltage is supplied;
- a second diode, to an anode of which the constant voltage is supplied;
- and
- a difference current generation circuit, which generates a difference current between a first current flowing in the first diode and a second current flowing in the second diode, wherein
- the difference current generation circuit comprises:
- a first current mirror circuit which is provided on a cathode side of the first diode, and which generates a third current having a current value which is a product of the first current and a first current mirror ratio;
- a second current mirror circuit which is provided on a cathode side of the second diode, and which generates a fourth current having a current value which is a product of the second current and a second current mirror ratio;
- a third current mirror circuit, which generates either a fifth current having a current value which is a product of the third current and a third current mirror ratio, or a sixth current having a current value which is a product of the fourth current and the third current mirror ratio;
- and
- a coupling node at which are coupled a path of the fifth current and a path of the fourth current, or a coupling node at which are coupled a path of the sixth current and a path of the third current, wherein
- the difference current is generated at the coupling node.
8 more elements
(canceled)
(canceled)
(canceled)
A detector circuit, comprising:
- a first rectifying circuit, which rectifies a voltage resulting by adding a voltage corresponding to an input signal and a first voltage based on a bias voltage;
- a first current detector circuit, which detects a current rectified by the first rectifying circuit;
- a second rectifying circuit, which rectifies a second voltage based on the bias voltage;
- a second current detector circuit, which detects a current rectified by the second rectifying circuit;
- and
- a current difference detector circuit, which detects a difference between a current detected by the first current detector circuit and a current detected by the second current detector circuit, wherein
- the first current detector circuit, the second current detector circuit and the current difference detector circuit each comprises a current mirror circuit;
- and
- a mirror ratio of at least one of the current mirror circuits is adjusted.
6 more elements
(canceled)
(canceled)
(canceled)
Dependencies are inferred from the claim text.