Adaptive receiver system that adjusts to the level of interfering signals
View Patent ↗Adaptive receiver system that adjusts to the level of interfering signals. An adaptive system is provided for use with a radio receiver to adapt to interfering signals associated with a received RF signal. The radio receiver includes a LNA to receive the RF signal and produce an amplified signal that is coupled to a down-converting mixer that produces a mixer output. A peak detector is coupled to receive the mixer output to produce a peak signal. An integrator is coupled to the peak detector to receive the peak signal and produce an integrated signal and a mixer is coupled to receive the integrated signal and a transmit power indicator to produce a current control signal that is coupled to the LNA. The current control signal is used to control a bias current of the LNA, so that cross modulation associated with the received RF signal is reduced.
1. A radio receiver having an LNA to receive an RF signal and produce an amplified signal that is coupled to a down-converting mixer that produces a mixer output, and the radio receiver comprises:
a peak detector coupled to receive the mixer output to produce a peak signal;
an integrator coupled to the peak detector to receive the peak signal and produce an integrated signal;
a second mixer coupled to receive the integrated signal and a transmit power indicator to produce a current control signal that is coupled to the LNA to control a bias current of the LNA, wherein cross modulation associated with the received RF signal is reduced.
2. A radio receiver having an LNA to receive an RF signal and produce an amplified signal that is coupled to a down-converting mixer that produces a mixer output, and the radio receiver comprises:
a peak detector coupled to receive the mixer output to produce a peak signal;
an integrator coupled to the peak detector to receive the peak signal and produce an integrated signal; a second third mixer coupled to an output of the integrator and a receiver gain control signal to produce a VCO current control signal that is coupled to a VCO associated with a PLL that drives the down-converting mixer, wherein the reciprocal mixing associated with the received RF signal is reduced by adjustment of the VCO associated with the PLL.
3. An adaptive system for use with a radio receiver to adapt to interfering signals associated with a received RF signal, the radio receiver includes an LNA to receive the RF signal and produce an amplified signal that is coupled to a down-converting mixer that produces a mixer output, the adaptive system comprises:
a peak detector coupled to receive the mixer output to produce a peak signal;
an integrator coupled to the peak detector to receive the peak signal and produce an integrated signal; and
a second mixer coupled to receive the integrated signal and a transmit power indicator to produce a current control signal that is coupled to the LNA to control a bias current of the LNA, wherein cross modulation associated with the received RF signal is reduced.
4. The adaptive system of claim 3 , further comprising a filter coupled to receive the mixer output of the downconverting mixer and produce a filtered output that is coupled to the peak detector.
5. The adaptive system of claim 3 , further comprising an LNA control circuit coupled to the second mixer to receive the current control signal and produce a LNA control signal that is coupled to the LNA to control a bias current of the LNA, wherein cross modulation associated with the received RF signal is reduced.
6. An adaptive system for use with a radio receiver to adapt to interfering signals associated with a received RF signal, the radio receiver includes an LNA to receive the RF signal and produce an amplified signal that is coupled to a down-converting mixer that produces a mixer output, the adaptive system comprises:
a peak detector coupled to receive the mixer output to produce a peak signal;
an integrator coupled to the peak detector to receive the peak signal and produce an integrated signal; and
a second mixer coupled to the integrated signal and a receiver gain control signal to produce a VCO current control signal that is coupled to a VCO associated with a PLL that drives the down-converting mixer, wherein reciprocal mixing associated with the received RF signal is reduced by adjustment of the VCO associated with the PLL.
7. The adaptive system of claim 6 , wherein the VCO control current signal is coupled to the VCO associated with the PLL via a VCO control circuit.
8. The adaptive system of claim 6 , wherein the peak detector comprises a diode element.
9. An adaptive system for use with a radio receiver to adapt to interfering signals associated with a received RF signal, the radio receiver includes an LNA to receive the RF signal and produce an amplified signal that is coupled to a down-converting mixer that produces a mixer output, the adaptive system comprises:
a nonlinear element coupled to receive the mixer output to produce a peak signal;
an integrator coupled to the non-linear element to produce an integrator output; and
a second mixer coupled to receive the integrator output and a receiver power indicator to produce a receive control signal.
10. The adaptive system of claim 9 , wherein the receive control signal is coupled to a receive control circuit, and wherein an output of the receive control circuit is coupled to the down-converting mixer to adjust the down-converting mixer in order to reduce intermodulation distortion.
11. A method for providing an adaptive system for use with a radio receiver to adapt to interfering signals associated with a received RF signal, the radio receiver includes an LNA to receive the RF signal and produce an amplified signal that is coupled to a down-converting mixer that produces a mixer output, the method comprising steps of:
deriving a peak signal from the mixer output;
integrating the peak signal to produce an integrated signal;
mixing the integrated signal and a transmit power indicator to produce a current control signal; and
controlling a bias current of the LNA with the current control signal, wherein cross modulation associated with the received RF signal is reduced.
12. A method for providing an adaptive system for use with a radio receiver to adapt to interfering signals associated with a received RF signal, the radio receiver includes an LNA to receive the RF signal and produce an amplified signal that is coupled to a down-converting mixer that produces a mixer output, the method comprising steps of:
deriving a peak signal from the mixer output;
integrating the peak signal to produce an integrated signal;
mixing the integrated signal and a receive power indicator to produce a VCO control signal; and
controlling a VCO based on the VCO control signal, wherein the VCO is associated with a PLL coupled to the down-converting mixer, and wherein the reciprocal mixing associated with the received RF signal is reduced by adjustment of the VCO associated with the PLL.
13. A method for providing an adaptive system for use with a radio receiver to adapt to interfering signals associated with a received RF signal, the radio receiver includes an LNA to receive the RF signal and produce an amplified signal that is coupled to a down-converting mixer that produces a mixer output, the method comprising steps of:
deriving a peak signal from the mixer output;
integrating the peak signal to produce an integrated signal;
mixing the integrated signal and a receive power indicator to produce a receive control signal; and
controlling the down-converting mixer based on the receive control signal, wherein intermodulation distortion associated with the received RF signal is reduced.