A method for restraining the spurious in-band and transmitter

Abstract

The disclosed emitter for inhibiting band-in stray comprises: a DAC converses digital signal into analog quantity, a frequency hopping device generates two local-oscillation signals and switches their transmission to generate frequency-hopping frequency; an amplifier amplifies signal; a mixer mixes the analog and local-oscillation signal, and using a RF amplifier to amplify and emit the mixed carrier. There is also an attenuator in frequency hopping channel to reduce or avoid stray on switch and local-oscillation amplifier.

Description

technical field [0001] The invention relates to electronic technology in the field of communication, in particular to anti-jamming technology in the field of communication. Background technique [0002] Modern electronic equipment relies heavily on clocks and oscillators for timing signals, such as personal computers (PCs), home electronics and electrical equipment (which now typically include microprocessors and digital circuits), telephone switches, radio equipment (including cellular telephone), etc. [0003] A characteristic of oscillators and clocks is the generation of unwanted emissions of electromagnetic energy, which can cause problems not only for other nearby equipment, but also for surrounding circuitry within the same equipment component as the oscillator and clock. For example, in a wireless receiver, an oscillator in the surrounding circuitry can be used in the Interference occurs in a wireless receiver, "interference" can refer to radiated or conducted inte...

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Problems solved by technology

[0017] However, the above-mentioned spurs generated by the transmitter during frequency hopping are signals with a wider frequency band including the local oscillator signals generated by the local oscillator sources 109 and 110

This stray local oscillator signal is mixed with the intermediate frequency signal produced by the intermediate frequency amplifier 102, and a signal with a wider frequency spectrum will be generated at the output of the mixer 103, and the out-of-band signal is filtered out by the output filter 104. But the in-band signal cannot be filtered out

This local oscillator signal with spurs will leak to the output of the mixer 103 through the mixer 103. Similarly, the out-of-band signal is filtered out by the output filter 104, but the in-band signal cannot be filtered out.

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