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US 11,451,201 B1Granted
Differential diode-based variable impedance modules
AssigneeMarvell Asia Pte Ltd
InventorsJames Hoffman, Florin Pera
Life of this patent
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Abstract
The present invention is directed to electrical circuits. More specifically, an embodiment of the present invention provides a variable impedance module with a first capacitor coupled to a first input terminal and the second capacitor coupled to a second input terminal. A diode bridge is connected between the input capacitors. The anodes of the top diodes are connected to a supply through a resistor, and the cathodes of the lower diodes are connected to a high-impedance current source. A third capacitor is connected between these two nodes.
Claims17
A variable impedance module comprising:
- a first input terminal;
- a first capacitor coupled to the first input terminal;
- a second input terminal;
- a second capacitor coupled to the second input terminal;
- a first diode comprising a first cathode and a first anode, the first cathode being coupled to the first capacitor;
- a second diode comprising a second cathode and a second anode, the second cathode being coupled to the second capacitor, the second anode being coupled to the first anode;
- a third diode comprising a third cathode and a third anode, the third anode being coupled to the first cathode and the first capacitor;
- a fourth diode comprising a fourth cathode and a fourth anode, the fourth anode being directly coupled to the second cathode and second capacitor and the fourth cathode being connected to the third cathode;
- and
- a third capacitor coupled between the first anode and the third cathode.
7 more elements
A differential amplifier comprising:
- a first input switch comprising a first emitter terminal, a first base terminal and a first collector terminal, the first base terminal being coupled to a first input terminal and the first collector terminal being coupled to a first output terminal;
- a second input switch comprising a second emitter terminal, a second base terminal and a second collector terminal, the second base terminal being coupled to a second input terminal and the second collector terminal being coupled to a second output terminal;
- and
- a variable impedance module coupled to the first collector and the second collector terminals, the variable impedance module configured to vary impedance between the first collector and the second collector terminals,
- wherein the variable impedance module comprises four diodes arranged in a bridge including a first pair of series-connected diodes connected in parallel to a second pair of series-connected diodes, a plurality of capacitors connected to the bridge, and a current source configured to bias the diodes in the bridge.
2 more elements
A differential amplifier comprising:
- a first input switch comprising a first emitter terminal, a first base terminal and a first collector terminal, the first base terminal being coupled to a first input terminal and the first collector terminal being coupled to a first output terminal;
- a second input switch comprising a second emitter terminal, a second base terminal and a second collector terminal, the second base terminal being coupled to a second input terminal and the second collector terminal being coupled to a second output terminal;
- and
- a variable impedance module coupled to the first collector and the second collector terminals, the variable impedance module configured to vary impedance between the first collector and the second collector terminals;
- wherein the variable impedance module comprises:
- a third input terminal coupled to the first collector terminal;
- a first capacitor coupled to the third input terminal;
- a fourth input terminal coupled to the second collector terminal;
- a second capacitor coupled to the fourth input terminal;
- a first diode comprising a first cathode and a first anode, the first cathode being coupled to the first capacitor;
- a second diode comprising a second cathode and a second anode, the second cathode being coupled to the second capacitor, the second anode being coupled to the first anode;
- a third diode comprising a third cathode and a third anode, the third anode being coupled to the first cathode and the first capacitor;
- a fourth diode comprising a fourth cathode and a fourth anode, the fourth anode being coupled to the second cathode and second capacitor and the fourth cathode being coupled to the third cathode;
- a third capacitor coupled between the first anode and the third cathode;
- a resistor coupled to the first anode;
- and
- a first current source coupled to the third cathode.
14 more elements
Dependencies are inferred from the claim text.