Low gain linearization for high signal-to-noise ratio
AssigneeQUALCOMM Incorporated
InventorsSasha VUJCIC, Mehmet UZUNKOL, Kevin Hsi Huai WANG
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Abstract
A low noise amplifier (LNA) includes a transconductance device coupled to a cascode transistor. The LNA also includes a resistor capacitor (RC) feedback branch. The RC feedback branch includes a first resistor, a capacitor and a first switch. The RC feedback branch is fed back around the transconductance device and is coupled between a drain of either the cascode transistor or the transconductance device and a gate of the transconductance device.
Claims22
A low noise amplifier (LNA) comprising:
- a transconductance device coupled to a cascode transistor;
- and
- a resistor capacitor (RC) feedback branch comprising a first resistor, a capacitor and a first switch fed back around the transconductance device, the RC feedback branch being coupled between a drain of the cascode and a gate of the transconductance device or coupled between the gate of the transconductance device and a node between a source of the cascode transistor and a drain of the transconductance device.
A method comprising:
- amplifying a radio frequency (RF) input signal with a gain transistor to produce an amplified signal;
- and
- selectively coupling a feedback branch around the gain transistor, the feedback branch being coupled between a drain of a cascode transistor and a gate of the gain transistor or coupled between the gate of the gain transistor and a node between a source of the cascode transistor and a drain of the gain transistor.
A low noise amplifier (LNA), comprising:
- means for amplifying a radio frequency (RF) input signal to produce an amplified signal;
- means for selectively coupling a feedback branch around the amplifying means, the feedback branch coupled between a drain of a first device and a gate of the amplifying means;
- and
- means for selectively cancelling a first nonlinear tone of the amplifying means by selectively coupling a feedforward branch to the drain of the amplifying means, the feedforward branch generating a second nonlinear tone to cancel the first nonlinear tone.
(canceled)
(canceled)
A low noise amplifier (LNA) comprising:
- a transconductance device coupled to a cascode transistor;
- a resistor capacitor (RC) feedback branch comprising a first resistor, a capacitor and a first switch fed back around the transconductance device, the RC feedback branch being coupled between a drain of either the cascode transistor or the transconductance device and a gate of the transconductance device;
- and
- a feedforward branch coupled to the drain of the transconductance device via a second switch, the feedforward branch including a diode connected device and a second resistor coupling a source terminal of the diode connected device to ground, a drain of the diode connected device coupled to the second switch.
A method comprising:
- amplifying a radio frequency (RF) input signal with a gain transistor to produce an amplified signal;
- selectively coupling a feedback branch around the gain transistor, the feedback branch being coupled between either a drain of a cascode transistor or the gain transistor and a gate of the gain transistor;
- and
- selectively cancelling a first nonlinear tone of the gain transistor by selectively coupling a feedforward branch comprising a second transistor and a resistor to the drain of the gain transistor, the feedforward branch generating a second nonlinear tone to cancel the first nonlinear tone of the gain transistor.
Dependencies are inferred from the claim text.