pmos four-phase current source switch drive circuit
A switching drive circuit, four-phase current source technology, applied in electronic switches, electrical components, pulse technology and other directions, can solve the problem of poor synchronization of switch drive signal inversion and other problems, and achieve the advantages of layout design, reduce inversion cross points, reduce The effect of small switching noise
Active Publication Date: 2017-05-10
XIDIAN UNIV
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Problems solved by technology
[0007] The purpose of the present invention is to overcome the disadvantages of the current PMOS four-phase current source switch drive signal reversal synchronization is poor, to provide a PMOS four-phase current source switch drive circuit, improve the four-way drive signal reversal synchronization, and reduce the four-way The flip cross point of the drive signal eliminates the charge accumulation effect of the PMOS four-phase current source
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[0059] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0060] refer to figure 1 , The present invention includes a signal generation circuit 1, a primary latch circuit 2, a secondary latch circuit 3, a path control circuit 4 and a cross point adjustment circuit 5. The signal generating circuit 1 generates a four-phase switching signal A and outputs it to the first-level latch circuit 2 and the access control circuit 4 respectively; the first-level latch circuit 2 delays the four-phase switching signal A and outputs a delayed four-phase switching signal B to the second level The first stage latch circuit 3 and the cross point adjustment circuit 5; the second stage latch circuit 3 delays the once-delayed four-phase switch signal B again and then outputs the second-delayed four-phase switch signal C to the access control circuit 4; the access control The circuit 4 uses the four-phase switching signal A and the twice-delaye...
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The invention discloses a PMOS four-phase current source switch driving circuit which mainly solves the problem that switch driving signal synchronism of an existing PMOS four-phase current source is poor. The PMOS four-phase current source switch driving circuit comprises a signal generating circuit, a primary latch circuit, a secondary latch circuit, an access control circuit and an intersection adjusting circuit. The signal generating circuit generates four-phase switch signals; the primary latch circuit and the secondary latch circuit sequentially perform delay on the four-phase switch signals twice; the access control circuit generates access control signals by utilizing the four-phase switch signals and secondary delay signals of the four-phase switch signals and outputs the access control signals to the intersection adjusting circuit; and the intersection adjusting circuit adjusts the primary delay four-phase switch signals through the access control signals and outputs the signals adjusted to an external PMOS four-phase current source. The PMOS four-phase current source switch driving circuit improves switch driving signal synchronism, reduces intersections of the four-phase switch signals and can be used for manufacturing a digital-analog converter integrated circuit.
Description
technical field [0001] The invention belongs to the technical field of microelectronic circuits, in particular to a switch driving circuit for a PMOS four-phase current source. Background technique [0002] With the development of technology, high speed and high precision have become the design goal of digital-to-analog converters. Current-steering DAC (current-streeing DAC), as one of the mainstream DAC products at present, can well take into account the requirements of speed and precision. In the current steering digital-analog converter, the current source is an important part, and its performance determines the performance of the entire current steering digital-analog converter, and the switch drive circuit of the current source is the key to control the operation of the current source. [0003] The PMOS four-phase current source is a current source used in the current steering DAC, which consists of a source tube and four switch tubes. Two of the four switch tubes are...
Claims
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IPC IPC(8): H03K17/567
Inventor 庄奕琪汤华莲贾伟泉张丽许蓓蕾曾志斌
Owner XIDIAN UNIV