Unidirectional Networks for Millimeter-Wave Amplifiers Using On-Chip Transformers with Arbitrary Coupling Coefficients

Abstract

The invention discloses a millimeter wave amplifier unilateralization network using an on-chip transformer with a random coupling coefficient. The network comprises a common source structure amplifier (1) and the on-chip spiral transformer (2). A primary coil (21) and a secondary coil (22) of the transformer (2) are respectively connected to a grid electrode and a drain electrode of the common source structure amplifier (1), voltage-current feedback is introduced, specific unilateralization conditions are met by regulating a self-inductance value of the secondary coil and a grid-drain stray capacitance of a transistor is offset by resonance, so that reverse isolation of the common source amplifier is greatly improved and the defects of high requirement on the coupling coefficient of the transformer and poor reverse isolation of a conventional millimeter wave common source amplifier are overcome.

Description

technical field [0001] The invention relates to a unidirectional network of a millimeter wave amplifier, specifically a circuit network structure manufactured by semiconductor integrated circuit technology and using an on-chip spiral transformer to improve the reverse isolation of a millimeter wave common source amplifier. Background technique [0002] The parasitic capacitance inside the transistor, especially the parasitic capacitance between the gate and the drain, will introduce a parasitic reverse signal coupling path inside the tube. This internal feedback path often brings disadvantages to the design of millimeter wave amplifiers. Impact. For example, when designing a multi-stage common source amplifier, the input impedance will be affected when adjusting the output matching network of each stage amplifier, and the input matching network needs to be redesigned; after the input matching network is designed, the output impedance of the transistor will change again , wh...

AI Technical Summary

Problems solved by technology

However, in the millimeter-wave frequency band, it is difficult to realize a strongly coupled on-chip transformer with a coupling coefficient close to 1, because increasing the coupling between the primary and secondary coils of the transformer often introduces more parasitic capacitance into the transformer, thereby reducing the self-resonant frequency of the transformer

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