Current mode/voltage mode switchable amplifier
AssigneeQUALCOMM Incorporated
InventorsChirag Dipak PATEL, Lai Kan LEUNG, Xinmin YU, Timothy Donald GATHMAN
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Abstract
A switchable amplifier exhibits multiple modes of operation including a current mode and a voltage mode. The switchable amplifier includes a first transistor having a gate terminal coupled to a drain terminal, one or more second transistors having a gate terminal coupled to the gate terminal of the first transistor, a third transistor and a bias resistor across the third transistor. The third transistor is coupled between the gate terminal of the first transistor and the gate terminal of the one or more second transistors.
Claims26
A switchable amplifier, comprising:
- a first transistor having a gate terminal coupled to a drain terminal;
- at least one second transistor having a gate terminal coupled to the gate terminal of the first transistor;
- a third transistor coupled between the gate terminal of the first transistor and the gate terminal of the at least one second transistor;
- and
- a bias resistor across the third transistor.
A method of switching between multiple modes in an amplifier, the method comprising:
- enabling a switch between a gate of a diode-connected transistor and a gate of at least one second transistor to short a bias resistor coupled between the gate of the diode-connected transistor and the gate of the at least one second transistor to operate the amplifier in a first mode based at least in part on a first mode-switching indicator:
- and
- disabling the switch to un-short the bias resistor to operate the amplifier in a second mode based at least in part on a second mode-switching indicator.
A switchable amplifier, comprising:
- a first transistor;
- at least one second transistor having a gate coupled to a gate of the first transistor;
- and
- means for switching the amplifier between a first mode and a second mode, the means for switching coupled between the gate of the first transistor and the gate of the at least one second transistor.
A switchable amplifier, comprising:
- a current mirror circuit comprising a first transistor and a second transistor, the second transistor configured to receive a radio frequency (RF) input signal;
- and
- a third transistor configured to adjust an input impedance of the second transistor.
Dependencies are inferred from the claim text.