Broadband receiver circuit with adjustable impedance matching frequency

Abstract

The invention relates to a broadband receiver circuit with adjustable impedance matching frequency, which belongs to the field of radio frequency integrated circuits. The broadband receiver circuit comprises a low-noise transconductance amplifier, two passive frequency mixers, a quadrature trans-impedance amplifier I path, a quadrature trans-impedance amplifier Q path, a feedback resistor, two double-pole double-throw switches and four variable resistors, wherein a radio frequency input signal is connected with an input end of the low-noise transconductance amplifier and is connected with an input end of the second passive mixer through using the feedback resistor; an output end of the low-noise transconductance amplifier is connected with a signal input end of the first passive mixer; clock input ends of the two passive mixers are connected with four-phase non-overlapping clock signals; a signal output end of the first passive mixer is connected with a differential input end of the Ipath and a differential input end of the Q path; differential output signal ends of the I path and the Q path are connected with a four-phase input end of the second passive mixer; and the four variable resistors are bridged at input ends and output ends of the I path and the Q path through using the two double-pole double-throw switches. The broadband receiver circuit is suitable for zero-intermediate-frequency and low-intermediate-frequency receiver schemes.

Description

technical field [0001] The invention belongs to the technical field of receiver circuit design in radio frequency integrated circuit technology, in particular to a broadband receiver circuit with adjustable impedance matching frequency. Background technique [0002] The next generation of wireless communication requires that the front end of the radio frequency transceiver chip can cover a wide frequency band. For example, the fifth generation of mobile communication (5G) requires that the transceiver can support carrier frequencies from hundreds of MHz to 6GHz. The performance requirement of wideband adjustable carrier frequency poses a challenge to the design of RF receiver chips, especially for the front-end low-noise amplifier, which not only requires low noise figure and high dynamic range, but also requires the input matching circuit to cover the entire frequency band . [0003] In a traditional broadband receiver circuit, the function of input impedance matching is u...

AI Technical Summary

Problems solved by technology

The disadvantage of this technique is that it is only applicable to receivers with zero-IF structure, that is, the local oscillator clock frequency f LO and the carrier frequency f of the RF signal RF must be equal

In this case, the original technology cannot meet the design requirements of input impedance matching

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