Low power semi-active and semi-passive broadband down mixer

Abstract

The invention discloses a low power semi-active and semi-passive broadband down mixer. The low power semi-active and semi-passive broadband down mixer finishes a frequency mixing function by a current mirror amplifier (M1-M12) composed of four basic current mirrors and an embedded passive switch core (M17-M20). The current mirror amplifier is used for executing an input stage and an output stage of the mixer, and a two-input port and quad-output port structure of the current mirror amplifier is equivalent to a double-balanced topological structure of a traditional Gilbert mixer. The passive switch core is embedded between grids of input and output MOS (Metal Oxide Semiconductor) tubes of the current mirror amplifier, and the passive switch core has no DC bias current and does not consume voltage drops and introduce power consumption, so that the flicker noise and linearity of the mixer can be improved; meanwhile, a conduction resistor of the passive switch core MOS tube acts as a series peak resistor, so that the operation bandwidth of the mixer is expanded. The mixer does not adopt an inductance passive element but has the respective advantages of an active Gilbert mixer and a passive mixer, and the mixer can meet the performance requirement of a multi-standard radio frequency receiver.

Description

technical field [0001] The invention relates to a low-power semi-active and semi-passive broadband down-mixer, which uses a current mirror amplifier and an embedded passive switch core to complete the frequency mixing function, and belongs to the field of analog integrated circuits. Background technique [0002] In the current wireless communication field, various communication standards, such as 2G / 3G / 4G, WLAN, Bluetooth, UWB, GPS, RFID, etc., play an important role in specific wireless communication fields. With the continuous development of wireless communication technology, the research on multi-standard transceiver systems compatible with different communication standards is becoming more and more urgent. Since the multi-standard transceiver system needs to be compatible with many different communication standards at the same time, higher design requirements are also put forward for the corresponding transceiver RF front-end circuit. [0003] As an important component ...

AI Technical Summary

Problems solved by technology

On the other hand, the active Gilbert mixer uses MOS tube stacking structure vertical commutation to complete frequency conversion. Although it can obtain large conversion gain and good port isolation characteristics; it does not support process generation reduction and cannot meet low voltage requirements. Circuit design requirements, it is difficult to reduce power consumption, but also produce serious flicker (1 / f) noise

[0006] Passive mixers such as figure 2 As shown, the frequency conversion is completed by using the capacitive direct coupling structure horizontal commutation, which can reduce the number of stacked layers of MOS tubes and realize the design of low voltage and low power consumption; the passive mixer switch stage has no DC current, which can reduce 1 / f noise and Improves linearity; but it does not provide conversion gain and requires strong LO drive power

Images