Low-power-consumption receiver of silent surface wave filter

Abstract

The invention discloses a low-power-consumption receiver of a silent surface wave filter. The low-power-consumption receiver comprises an N-channel filter, a transconductance amplifier, a frequency mixer and a trans-impedance amplification circuit; the N-channel filter, the transconductance amplifier, the frequency mixer and the trans-impedance amplification circuit are connected in sequence, andthe front end of the N-channel filter is provided with input matching formed by an inductor and a capacitor. According to the receiver in the scheme, the N-channel filter is arranged in front of the low-noise amplifier, so that radio frequency filtering can be prevented from being carried out before a signal enters the low-noise amplifier, and linearity deterioration caused by the low-noise amplifier can be avoided. In addition, the switch size in the N-channel filter can be small, the out-of-band blocking inhibition capability deterioration caused by the switch impedance can be avoided, and the power consumption of the local oscillation signal buffer can be reduced.

Description

technical field [0001] The invention relates to the technical field of radio frequency integrated circuits, in particular to a low-power receiver of an audible surface wave filter. Background technique [0002] With the rapid development of the Internet of Things and various communication standards (such as cellular networks, Wi-Fi, and Bluetooth), more and more wireless communication systems need to be integrated into a modern smart terminal. The main challenges faced by these communication systems are strict power consumption overhead and low cost requirements. One of the main means is to avoid the use of expensive off-chip SAW filters to save cost and system volume. However, without a SAW filter that provides sufficient RF filtering capability, it is difficult for these SAW-filtered receivers to work properly with large out-of-band blocking and allow different communication systems to coexist on the same chip. [0003] For this reason, it is very important to improve the...

AI Technical Summary

Problems solved by technology

However, the resulting out-of-band rejection is limited due to the presence of switch resistance, which will limit the out-of-band linearity performance of the receiver

Lowering the switch resistance helps maintain the receiver's out-of-band rejection, but as the switch size increases, parasitic capacitance increases, at the cost of increased local oscillator buffer power consumption and the resulting out-of-band rejection Still can hardly exceed 20dB

Using a coupled N-channel filter with a gyrator can also improve the out-of-band rejection of the receiver, but the DC power consumption is too high for low-power short-range communications

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