A Dual Mode Low Noise Amplifier
A low-noise amplifier and dual-mode technology, which is applied in the direction of improving the amplifier to reduce the impact of noise, can solve problems affecting circuit performance, etc., to achieve the effect of suppressing the impact of circuit performance and solving carrier leakage
Active Publication Date: 2017-01-18
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
In addition, the RF front-end circuit is very sensitive to process-voltage-temperature (PVT, Process-Voltage-Temperature) changes, and changes in PVT often greatly affect circuit performance
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[0022] A dual-mode low-noise amplifier of the present invention will be further described below in conjunction with the accompanying drawings.
[0023] refer to figure 1 , a dual-mode low-noise amplifier provided by the present invention is composed of a fully differential low-noise amplifier and a dual-mode replica bias circuit. RF op is the positive output of the differential amplifier; RF on It is the negative output terminal of the differential amplifier.
[0024]In the LNA core circuit, the drain of the first NMOS transistor NM1 is connected to the source of the third NMOS transistor NM3; the drain of the second NMOS transistor NM2 is connected to the source of the fourth NMOS transistor NM4; the drain of the third NMOS transistor NM3 is connected to the source of the third NMOS transistor NM3 The drain of a PMOS transistor PM1 is connected; the drain of the fourth NMOS transistor NM4 is connected to the drain of the second PMOS transistor PM2; the gates of the third N...
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The invention discloses a dual-mode low-noise amplifier, which belongs to the field of radio frequency integrated circuit design. The amplifier includes a low-noise amplifier LNA core circuit and a dual-mode switch-controllable replica bias circuit, and the switch-controllable replica bias circuit provides all the bias required for the core circuit; by controlling the switch-controllable replica bias circuit The switch S of the type bias circuit is used to make the LNA core circuit work in two different states, that is, the high gain mode and the high linearity mode; wherein, when the fixed end c of the switch S is connected to the moving end a of the switch S, the LNA Work in high linearity mode; when the fixed end c of the switch S is connected to the contact moving end b of the switch S, the LNA works in the high gain mode. The bias circuit in this circuit completely replicates the amplifier circuit and the bias circuit adopts a current mirror structure, so that the current of the whole circuit is controlled by the reference current source, thereby suppressing the influence of PVT changes.
Description
technical field [0001] The invention belongs to the field of radio frequency integrated circuit design, and in particular relates to a dual-mode low-noise amplifier. Background technique [0002] In recent years, wireless communication technology has developed rapidly and plays an increasingly important role in social life. The development of wireless communication puts forward higher requirements on the front-end circuit of the transceiver. [0003] The RF analog front-end circuit of the receiver has problems such as a large number of components, high cost, large power consumption, and large volume. However, for the transceiver, whether it is transmitting or receiving data, the antenna will continuously transmit a large carrier signal, and the carrier signal passes through The circulator or directional coupler leaks into the front end of the receiver, and the energy can reach more than 0dBm, which is far greater than the energy of the received signal. And because most of ...
Claims
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IPC IPC(8): H03F1/26
Inventor 张长春高申俊王德波张鹏郭宇锋
Owner NANJING UNIV OF POSTS & TELECOMM