Power mixer circuit

Abstract

The invention discloses a power mixer circuit. A Gilbert mixer circuit and a power amplifier circuit are combined. The power mixer comprises a transconductance circuit, a gain bootstrap circuit, a switching stage circuit and a load circuit which are electrically connected in sequence. The transconductance stage circuit is used for inputting a baseband signal. The gain bootstrap circuit is used forstabilizing an output voltage of the transconductance stage circuit. The switching stage circuit is used for controlling a switching tube of the switching stage circuit according to a local oscillation signal, thus a switch tube acts as a switch, and the load circuit is used for connecting the load. Compared with the prior art, the power mixer circuit has the advantages of low power consumption,low cost and high linearity.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a multi-mode multi-frequency power mixer circuit. Background technique [0002] The traditional direct up-conversion multi-mode multi-frequency mixer and power amplifier circuit such as figure 1 Shown: After passing through the LPF (low-pass filter), the IQ two-way signal is directly up-converted with the local oscillator signal LOI and LOQ signal with a difference of 90 degrees, and then sent to the power amplifier (PA) after summing. The transmitter front ends for different modes or frequency bands are completely separated, such as figure 1 Mid-band (1) and Band (2). [0003] Such as figure 2 As shown, the traditional mixer adopts the Gilbert structure, and the power amplifier adopts the Class-AB (Class AB power amplifier) ​​mode. In the single-band case, two inductors are required; in the multi-band case, more inductors are required due to complete separatio...

AI Technical Summary

Problems solved by technology

[0003] like figure 2 As shown, the traditional mixer adopts Gilbert structure, and the power amplifier adopts Class-AB (Class AB power amplifier) ​​mode. In the case of single frequency band, two inductors are needed; Inductor, occupying a large number of chips, high cost

At the same time, the traditional mixer-plus-power-amplifier architecture is suitable for relatively large output power. Under the condition of output power of several dBm, the power consumption of this architecture is large, and in the case of multi-mode and multi-frequency, a large number of switches need to be added. There will be loss, resulting in low efficiency

In addition, usually under large-signal working conditions, the drain of the MOS transistor will have a large voltage fluctuation, and the large voltage fluctuation will cause a large change in the output impedance, which will cause nonlinearity and make the final emission The output spectrum of the machine contains large in-band components, which cannot achieve high linearity

Therefore, the current power mixer has high cost, high power consumption and low linearity

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