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US 2015/0311864 A1Published application
Switching system with linearizing circuit
AssigneeSkyworks Solutions, Inc.
InventorIbrahim Engin Pehlivanoglu
Life of this patent
Estimating the term…
Abstract
A transistor-based switch is coupled to a replica circuit that includes transistor circuitry similar to that of the switch. The replica circuit biases a switched transistor to promote linear operation of the switch.
Claims20
(canceled)
A switching system, comprising:
- a switch including one or more transistors;
- and
- a linearizing circuit including a reference resistance and a replica switching element circuit including one or more transistors, the linearizing circuit configured to control the replica switching element circuit to maintain a voltage drop across the replica switching element circuit at a level that corresponds to a voltage drop across the reference resistance, an output of the linearizing circuit responsive to the replica control signal to promote linearization of the switch, the switch responsive to one or more local oscillator (LO) signals of a radio-frequency circuit.
A wireless device comprising:
- a radio frequency antenna;
- a radio frequency transmitter coupled to the antenna;
- and
- a radio frequency receiver coupled to the antenna and including a switching system, the switching system including a switch having one or more transistors and further including a linearizing circuit having a reference resistance and a replica switching element circuit including one or more transistors, the linearizing circuit configured to control the replica switching element circuit to maintain a voltage drop across the replica switching element circuit at a level that corresponds to a voltage drop across the reference resistance, an output of the linearizing circuit responsive to the replica control signal to promote linearization of the switch, the switch responsive to one or more local oscillator (LO) signals of a radio-frequency circuit.
1 more element
A quadrature mixer comprising:
- an input stage having four inputs each configured to receive a respective one of a positive in-phase (Ip) signal, a negative in-phase (Im) signal, a positive quadrature (Op) signal, and a negative quadrature (Om) signal;
- four switching units each corresponding to a respective one of the four inputs and each including a switch having one or more transistors and further including a linearizing circuit including a reference resistance and a replica switching element circuit including one or more transistors, the linearizing circuit configured to control the replica switching element circuit to maintain a voltage drop across the replica switching element circuit at a level that corresponds to a voltage drop across the reference resistance, an output of the linearizing circuit responsive to the replica control signal to promote linearization of the switch, the switch responsive to one or more local oscillator (LO) signals of a radio-frequency circuit;
- and
- an output stage coupled to the four switching units and sequentially providing mixed output signals that correspond to the four inputs.
1 more element
Dependencies are inferred from the claim text.