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Managing spurs in RF circuits

A circuit and integrated circuit technology, applied in the direction of electrical components, multiplex communication, automatic power control, etc.

Active Publication Date: 2021-01-22
SILICON LAB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, coupling interference from adjacent circuits can present a problem in a monolithic integrated circuit, multiple chips in a single package, or even multiple chips on a printed circuit board

Method used

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  • Managing spurs in RF circuits
  • Managing spurs in RF circuits
  • Managing spurs in RF circuits

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Switching events and signals in adjacent circuits can generate noise or interference in sensitive analog and RF receiver circuits. In an example, harmonics from switching of digital circuits operating within an integrated circuit, circuits of a direct current-to-direct current (DC-DC) converter operating within an integrated circuit, or any combination thereof may be generated at RF frequency bands such as at 2.4 GHz ), where the received signal may have amplitudes in the microvolt (μV) range. In some examples, frequency planning techniques may include controlling the frequency used to turn on all circuits of an integrated circuit (IC) to reduce spurs in a desired passband by changing the frequency of operation as the desired receive channel changes. However, in a microcontroller unit (MCU), which is usually connected to other off-chip circuits, sometimes the operating frequency cannot be changed without affecting the operation of the system.

[0028] Embodiments of ci...

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Abstract

Managing spurs in radio frequency circuits is disclosed. In some embodiments, an integrated circuit may include a radio frequency synthesizer configured to provide a local oscillator (LO) signal at a selected frequency related to a frequency of interest. The integrated circuit may also include a reclocking circuit including a first input receiving a clock signal having a first frequency, a second input receiving a local timing signal related to the LO signal, and an output. The re-clocking circuit may be configured to provide a local timing output signal that is a frequency adjusted version of the clock signal based on the local re-clocking signal. The integrated circuit may further include digital circuitry including an input to receive the locally timed output signal as a digital clock signal in a receive mode.

Description

technical field [0001] The present disclosure generally relates to circuits and methods for managing spurs in radio frequency circuits, chips or systems. Background technique [0002] Radio Frequency (RF) receivers are used in a wide variety of devices, including but not limited to televisions, radios, mobile phones, pagers, Global Positioning System (GPS) devices, cable modems, cordless phones, door opening systems, and to receive or transmit RF signal to other devices. In some examples, RF receivers may utilize frequency translation or mixing. [0003] Most typical RF receivers use oscillators and analog multipliers or mixers to perform frequency translation or mixing. Oscillators typically output as a sine wave or have a tuning frequency (f LO ) a local oscillator (LO) signal in the form of a periodic waveform. The mixer can be configured to combine the RF input signal spectrum (which can be at a specific center frequency (f CH ) containing the desired spectral conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10
CPCH04B1/10H04J3/06H04J3/0685H03L7/099
Inventor J·M·库瑞
Owner SILICON LAB INC