# US 2014/0155009 A1 · Crystal control scheme to improve performance of a receiver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0155009 A1 - Document ID: US20140155009A1 - Status: Published application - Kind: A1 - Application number: 14/174,782 - Filed: 2014-02-06 - Published: 2014-06-05 - Earliest claimed: 2010-11-11 - Assignees: MaxLinear, Inc. - Applicants: MaxLinear, Inc. - Inventors: Sheng Ye - Web page: https://patentgrep.com/patent/US20140155009A1 ## CPC - H04B 1/10: Means associated with receiver for limiting or suppressing noise or interference - H03L 7/16: Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop - H04B 1/109: {by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input} - H04B: TRANSMISSION - H03L: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B) ## Abstract A circuit includes, in part, a receiver, a received signal strength indicator (RSSI), and an oscillator. The receiver receives an incoming signal and an oscillating signal. The RSSI is responsive to the receiver and generates an output signal representative of the strength of the incoming signal. The oscillator receives different biasing conditions in response to different outputs of the RSSI. The oscillator generates the oscillating signal received by the receiver. The oscillator receives a first biasing condition when the incoming signal is detected as having a strength lower than or equal to a predetermined threshold value and a second biasing condition when the incoming signal is detected as having a strength higher than the predetermined threshold value. The first biasing condition may be defined by a first current, and the second biasing condition may be defined by a sum of the first current and a second current. ## Claims ### Claim 1 A circuit comprising: a receiver receiving an incoming signal and an oscillating signal; a received signal strength indicator (RSSI) responsive to the receiver and adapted to generate an output signal representative of a strength of the incoming signal; and an oscillator adapted to receive different biasing conditions in response to different output signals of the RSSI, said oscillator generating the oscillating signal. ### Claim 2 (depends on 1) The circuit of claim 1 wherein the oscillator receives a first biasing condition when the incoming signal is detected as having a strength lower than or equal to a predetermined threshold value and a second biasing condition when the incoming signal is detected as having a strength higher than the predetermined threshold value. ### Claim 3 (depends on 1) The circuit of claim 1 wherein said first biasing condition is defined by a first current, and wherein said second biasing condition is defined by a sum of the first current and a second current. ### Claim 4 (depends on 1) The circuit of claim 1 wherein the output signal of the RSSI is in a first state when the incoming signal is detected as having a strength higher than a predetermined threshold value and a second state when the incoming signal is detected as having a strength equal to or less than the predetermined threshold value. ### Claim 5 (depends on 1) The circuit of claim 1 wherein the circuit further comprises a control loop adapted to supply a reference clock signal to the oscillator in response to the output signal of the RSSI. ### Claim 6 (depends on 5) The circuit of claim 5 wherein said control loop is selected from a group consisting of a phased-locked loop, a delay-locked loop, and a frequency-locked loop. ### Claim 7 (depends on 5) The circuit of claim 5 wherein said circuit is a wireless receiving circuit. ### Claim 8 (depends on 7) The circuit of claim 7 wherein said oscillator is a crystal oscillator. ### Claim 9 A method of controlling a biasing condition of an oscillator, the method comprising: receiving an incoming signal and an oscillating signal; generating an output signal representative of a strength of the incoming signal; and varying the biasing condition applied to the oscillator in response to the output signal, said oscillator generating the oscillating signal. ### Claim 10 (depends on 9) The method of claim 9 further comprising: applying a first biasing condition when the incoming signal is detected as having a strength lower than or equal to a predetermined threshold value; and applying a second biasing condition when the incoming signal is detected as having a strength higher than the predetermined threshold value. ### Claim 11 (depends on 9) The method of claim 9 wherein said first biasing condition is defined by a first current, and wherein said second biasing condition is defined by a sum of the first current and a second current. ### Claim 12 (depends on 9) The method of claim 9 further comprising: placing the output signal in a first state when the incoming signal is detected as having a strength higher than a predetermined threshold value; and placing the output signal in a second state when the incoming signal is detected as having a strength equal to or less than the predetermined threshold value. ### Claim 13 (depends on 9) The method of claim 9 further comprising: using a control loop to supply a reference clock signal to the oscillator in response to the output signal. ### Claim 14 (depends on 13) The method of claim 13 wherein said control loop is selected from a group consisting of a phased-locked loop, a delay-locked loop, and a frequency-locked loop. ### Claim 15 (depends on 13) The circuit of claim 13 wherein said incoming signal is a wireless signal received via an antenna. ### Claim 16 (depends on 15) The circuit of claim 15 wherein said oscillator is a crystal oscillator.