Reconfigurable Ultra-Broadband Low Noise Amplifier Based on Active Inductor
A low-noise amplifier, active inductor technology, applied in DC-coupled DC amplifiers, differential amplifiers, and improving amplifiers to expand bandwidth, etc. Effect of reduced area, good gain flatness, reduced noise figure
Active Publication Date: 2017-06-27
BEIJING UNIV OF TECH
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Problems solved by technology
With the development of integrated circuit technology, the feature size of the device is continuously reduced, and the process (process) deviation has more and more serious influence on the device characteristics and then on the low noise amplifier. Parasitics, including package parasitics, can also cause LNA performance to deviate from what was originally designed for
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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. However, the examples given are not intended to limit the present invention.
[0029] The invention is designed and verified based on TSMC RF CMOS 0.18μm technology. The whole circuit topology is as figure 1 As shown, it includes parallel feedback amplifier (1), Cascode amplifier (2), differential floating active inductor (3), common source feedback amplifier (4) and output buffer stage (5). Wherein, the parallel feedback amplifier (1) is composed of the first NMOS transistor (M1), the first PMOS transistor (M2) and the first feedback resistor (R1) in parallel; the Cascode amplifier (2) is composed of the second NMOS transistor (M3) and The third NMOS transistor (M4) constitutes; the differential floating active inductance (3) is composed of a first current source...
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The invention provides a reconfigurable ultra-wideband low-noise amplifier based on active inductance, which has the characteristics of high gain and adjustable gain, small area, low noise and the like. The LNA includes a shunt feedback amplifier, a Cascode amplifier, a fully differential floating active inductive feedback based common source amplifier and an output buffer stage. The parallel feedback amplifier uses resistors instead of traditional spiral inductors to achieve broadband input impedance matching, which reduces the area of the chip, and this structure increases the transconductance, so that the transconductance is changed from the original g mN or g mP become g mN +g mP , reducing the noise of the amplifier. Cascode amplifiers and common source amplifiers are cascaded to form an intermediate amplification stage, which increases the gain of the entire amplifier. The active inductance is a fully differential floating active inductance. The entire amplifier uses only one active inductance, which greatly reduces the area of the chip, and the inductance value can be changed by adjusting its bias voltage, thereby changing the low The gain of the noise amplifier realizes the adjustable gain.
Description
technical field [0001] The invention relates to the field of radio frequency integrated circuit design, in particular to a reconfigurable ultra-wideband low-noise amplifier based on active inductance. Background technique [0002] Inductors are widely used in low noise amplifier designs. On-chip passive inductance (PI) occupies most of the LNA chip area, and the quality factor (Q) and self-resonant frequency are low, and the inductance value and Q value cannot be adjusted. Development requirements for integration, low cost, broadband, and adjustable performance. [0003] In addition, it is well known that the performance of a low noise amplifier depends on the size of the device (element) and the bias state of the circuit. With the development of integrated circuit technology, the feature size of the device is continuously reduced, and the process (process) deviation has more and more serious influence on the device characteristics and then on the low noise amplifier. Par...
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IPC IPC(8): H03F1/26H03F1/42H03F3/45
Inventor 张万荣邓蔷薇金冬月谢红云赵飞义
Owner BEIJING UNIV OF TECH