Circuit of radio frequency amplifier

Abstract

The invention provides an amplifier circuit, which is composed of a first capacitor, a first transistor, a second transistor, a first resistor, a current source and a load. The first transistor is connected to the gate of the second transistor and is coupled to the signal input terminal. Both the first transistor and the source of the first transistor are grounded; the drain of the second transistor is connected to one end of the load and is also coupled to the signal output end. The drain of the first transistor is connected to the output of the current source, the gate of the first transistor through a first resistor, and the drain of the second transistor through a first capacitor. Through the technical proposal of the invention, the multiplexing of the bias current and the bias transistor in the amplification circuit is realized, the current use efficiency can reach 100% of the theory, and the low power consumption, low current and high performance design can be achieved to a greater extent.

Description

Technical field [0001] The present invention relates to the field of signal processing, in particular to a radio frequency amplifier circuit applied to a wearable device and a bias method thereof. Background technique [0002] With the rapid development of the Internet of Things market, the number and market share of wearable electronic devices have also grown rapidly. The rise of consumer applications such as smart watches, smart bracelets, and wireless headsets has promoted the popularity of the wearable market. However, in wireless electronic products such as watches, bracelets, earphones, etc., in order to achieve long-term mobile work, objectively wearable devices require lighter device weight, longer standby and working time, and therefore require low power consumption, Especially the power consumption requirements for chips are more urgent than other markets. [0003] In wearable devices, due to the small module size, the antenna is closer to the human body. The human body ...

AI Technical Summary

Problems solved by technology

[0007] It can be seen from the above that in order to ensure the accurate DC operating current of the amplifier, the existing amplifier circuit needs an additional part of the current to ensure t

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