Oscillator with transformer-type noise filter

Abstract

The invention discloses an oscillator with a transformer-type noise filter, and belongs to the field of radio frequency and millimeter wave integrated circuit design. The oscillator comprises a cross coupling dynatron consisting of a cross coupling N-channel metal oxide semiconductor (NMOS) pair and a cross coupling P-channel metal oxide semiconductor (PMOS) pair, a resonant cavity consisting of a resonant inductor and a resonant capacitor, and a noise filter consisting of a filter transformer and a filter capacitor, wherein the connected relation of each part is as follows: the drain end of the cross coupling dynatron is in parallel connection with the resonant cavity; the source end of the cross coupling NMOS pair of the cross coupling dynatron is connected with one end of the primary side of the filter transformer, and the other end of the primary stage of the filter transformer is grounded; the source of the cross coupling PMOS pair of the cross coupling dynatron is connected with one end of the secondary side of the filter transformer, and the other end of the secondary stage of the filter transformer is connected with a power supply; and the primary side and the secondary side of the filter transformer are respectively connected in parallel with a filter capacitor. By using the oscillator with the transformer-type noise filter provided by the invention, the phase noise of the oscillator can be reduced, and at the same time owing to no need of introducing two inductors, the area and cost are reduced.

Description

technical field [0001] The invention belongs to the field of radio frequency and millimeter wave integrated circuit design, in particular to an oscillator with low cost and low phase noise. Background technique [0002] With the advancement of deep submicron CMOS technology and the development of radio frequency integrated circuit technology, it has become possible to realize the entire radio frequency transceiver system on a single silicon chip. In the current market, for RF transceivers operating below 10GHz, the traditional GaAs process has been basically replaced by the CMOS process. Today, implementing wireless communication systems for second-generation (2G) and third-generation (3G) standards using RF CMOS processes is no longer difficult. The new communication standard puts forward more stringent requirements on the radio frequency transceiver system, especially for the multi-mode multi-band transceiver system. In order to ensure compatibility with various communica...

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Problems solved by technology

[0006] In view of this, the object of the present invention is to propose an oscillator with a transformer-type noise filter in order to overcome the deficiencies of the prior art, which can reduce phase noise and improve oscillation without increasing chip area and cost. device performance

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