Wideband balun‐LNA exploiting noise cancellation and compensation technique

Abstract

A wideband single-ended input, differential output balun-LNA is proposed for multi-standard wireless applications between 10 MHz and 3 GHz. The common-gate (CG) input stage in combination with a noise cancellation topology is adopted for wideband input matching and low-noise figure. An output stage with g m ″ compensation technique is utilised to promote the limited gain of the CG input stage, and obtain an optimised linearity performance. Realised in TSMC 180 nm RF CMOS process, the LNA provides a gain of 19.7 dB, a maximum input third-order interception point of 1.13 dBm, and a minimum NF AQ1 of 1.93 dB over a 3 dB bandwidth from 10 MHz to 1.7 GHz. Meanwhile, the proposed LNA shows good measured performance over the frequency band of 1.7-3 GHz.

Noise figure and input intercept point's errors in an AGC‐less microwatt ultrawideband system (limiter and low noise amplifier)

“…The π‐match network is applied for impedance‐matching, the limiter realizes noise/distortion cancelation topology, and the onchip transformer (TF) is used as an inverting‐gain unit to realize g m ‐boosting topology. The limiter decreases amplitude of all RF‐waves sharply at the LNA's input‐port to provide a linear LNA, while other works tried to enhance their LNAs’ linearity by increasing IIP [77–141]. Based on Equation (), the LNA and its next circuits will never get saturated if the input of LNA remains under 50 mV by the limiter.…”

“…Several ideas have been proposed since 1960 [2] to design WB/UWB LNAs that the most remarkable ones were ‐boosting [45–108] and noise/distortion cancellation [77–141] topologies. ‐boosting can render a low noise figure (NF), low power consumption () and flat gain, that its general idea is based on a common‐gate (CG) amplifier which its and NF were reduced simultaneously by an inverting gain unit (‐A) applied between the source and gate terminals of CG [51].…”

Balun LNA Thermal Noise Analysis and Balancing With Common-Source Degeneration Resistor

“…In [12] an ESD-protected Balun LNA with an inductorless broadband input matching is offered, the amplification stage exploited double current reuse and a single-stage thermal noise cancellation to enhance the gain, NF and power consumption. In [13] a Balun LNA using g m compensation technique at the output to improve the limited gain of the CG stage. The Balun LNA is working in parallel with two g m compensation transistors; one for every output stage; improving the gain by 5.4-5.8 dB, this technique also improved the linearity performance.…”

Analysis and design of ultra‐wideband low noise amplifier using complementary structure with series inductive peaking technique and shunt feedback

“…[12][13][14] Although these LNAs achieve high gain and good input impedance matching, they suffer from poor noise performance. To counter the noise issue, noise cancellation techniques are used in Guo et al 15 and Liu et al, 16 which result in good noise performance and high gain, but power consumption is noticeably increased.…”