Single-converted-to-double low noise amplifier with highly balanced and stabilized differential output gain phase

Abstract

The invention discloses a single-converted-to-double low noise amplifier with a highly balanced and stabilized differential output gain phase. The amplifier comprises a common source or common emitter input amplifying transistor pair which comprises a first transistor and a fourth transistor, a common gate or common base amplifying transistor pair which comprises a second transistor and a third transistor, a tail current source pipe and output load circuits with tight coupling differential inductors; a fourth inductor L4 and a fifth inductor L5 are tight coupling differential inductors; C1 and C2 are differential capacitors with the same capacitance values; L0 and L1 also are tight coupling differential inductors. For the amplifier disclosed by the invention, since output loads adopt the tight coupling differential inductors L4 and L5 and the differential capacitors C1 and C2 for resonance, the balance and the stability of the differential output gain phase are improved, and the high-impedance tail current source pipe M5 can well restrain a common mode signal. The amplifier disclosed by the invention has excellent robustness when the PVT (Pressure Volume Temperature) and a working frequency point are changed, and at the same time, the amplifier has an excellent anti-interference capacity for the medium base noise.

Description

technical field [0001] The invention relates to a highly balanced and robust single-turn double low-noise amplifier with differential output gain and phase. Background technique [0002] In GNSS such as Beidou, GPS, Galileo, GLONASS and other satellite navigation systems receiving system-on-chip SoC, analog radio frequency circuit modules are easily interfered by digital modules. Since the full differential structure suppresses common-mode interference and noise very well, so the full differential structure It is widely used in silicon-based RF analog integrated circuit chips. However, since the signal from the antenna to the receiving system is usually a single-ended unbalanced signal, a low-noise amplifier at the front end of the receiver is required to convert the single-ended unbalanced signal into two differential signals with opposite phases and the same amplitude. [0003] One of the most direct ways to achieve single-ended to differential conversion is to add an off...

AI Technical Summary

Problems solved by technology

The single-rotation dual low-noise amplifier has the following problems: (1) Same as the above-mentioned Chinese patent, the two symmetrical load impedances ZL have no mutual coupling, and the output terminals RF(out+), RF(out-) output the balance of the differential signal Poor; (2) No high-impedance tail current source is set, so the common-mode signal cannot be suppressed, which further affects the balance of the differential signal output by the output terminals RF(out+) and RF(out-)

[0006] In addition, the existing single-ended to differential low noise is very sensitive to changes in PVT and operating frequency points, and some of them are also sensitive to common mode interference and dielectric floor noise

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