Reciever dynamically switching to pseudo differential mode for SOC spur reduction
AssigneeTexas Instruments Incorporated
InventorsCharles G. Lin, Burak Kelleci, Halil Kiper, Yuanying Deng
Life of this patent
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Abstract
A low noise amplifier in an integrated circuit, the circuit having a digital portion and an analog portion on a common substrate, the digital portion having at least one clocking frequency, includes an input configured to receive a signal at a tuned frequency and an output circuit. The output circuit is configurable to operate in either a single-ended mode or a pseudo differential-ended mode, wherein the output circuit is configured in the pseudo differential-ended mode when the tuned frequency is substantially similar to the at least one clocking frequency or one of its harmonics and otherwise configured in the single-ended mode.
Claims20
A low noise amplifier in an integrated circuit, the circuit having a digital portion and an analog portion on a common substrate, comprising:
- an input configured to receive a signal at a tuned frequency;
- a first amplifier in communication with the input and configured to generate a first amplifier output based on the signal;
- a second amplifier configured to generate a second amplifier output, the second amplifier configurable in a first mode and a second mode, wherein in the first mode the second amplifier output is a high-impedance state and in the second mode the second amplifier output is related to noise coupled from the common substrate to the second amplifier;
- and
- an output configured to provide the first amplifier output and the second amplifier output as output signals of the low noise amplifier.
The low noise amplifier wherein the second amplifier operates in the first mode when an enable signal is in a first state and operates in the second mode when the enable signal is in a second state.
A method of receiving a radio frequency signal in an integrated circuit, the circuit having a digital portion and an analog portion on a common substrate, comprising:
- receiving the radio frequency signal at a tuned frequency;
- amplifying the received radio frequency signal using a first amplifier to generate a first amplifier output based on the received radio frequency signal;
- configuring a second amplifier in either a first mode or a second mode, wherein in the first mode the second amplifier output is a high-impedance state and in the second mode the second amplifier output is related to noise coupled from the common substrate to the second amplifier;
- and
- providing, as output signals, the first amplifier output and the second amplifier output.
A low noise amplifier in an integrated circuit, the circuit having a digital portion and an analog portion on a common substrate, the digital portion having at least one clocking frequency, the low noise amplifier comprising:
- an input configured to receive a signal at a tuned frequency;
- and
- an output circuit configurable to operate in either a single-ended mode or a pseudo differential-ended mode, wherein the output circuit is configured in the pseudo differential-ended mode when the tuned frequency is substantially similar to the at least one clocking frequency or one of its harmonics and otherwise configured in the single-ended mode.
Dependencies are inferred from the claim text.