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High-speed current switch driver based on MOS current-mode logic

A technology of current mode logic and current switch, applied in the field of MCML high-speed current switch driver, can solve the problems of increasing difficulty in signal post-processing, increasing chip cost and design difficulty, reducing the breakdown effect, eliminating burrs and traps, preventing Simultaneous shutdown effect

Active Publication Date: 2009-10-21
陕西光电子先导院科技有限公司
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AI Technical Summary

Problems solved by technology

[0004] However, due to the asynchronous driving signal, clock breakdown effect or improper setting of the control signal, the traditional current switch will cause a large distortion of the output signal, which increases the difficulty of the post-processing of the signal, resulting in the need to attach other shaping circuits, which increases the cost of the chip. and design difficulty

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  • High-speed current switch driver based on MOS current-mode logic
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Embodiment Construction

[0032] In order to express the technical solutions and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] At first, the technical term involved in the present invention is described as follows:

[0034] MCML: MOS Current Mode Logic, MOS current mode logic, has a small power consumption delay product, adjustable output swing, and can maintain a high speed under low power supply voltage.

[0035] The output swing of an MCML circuit can be expressed as:

[0036] ΔV=I×R P

[0037] Among them, I is the bias current value flowing through the branch, and R P for adjusting the resistance value. That is, the output swing can be adjusted by adjusting the current value or the resistance value. In order to ensure the normal operation of the circuit, the resistance value R P Adjustment is made so that the current value I does not change.

[...

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Abstract

The invention provides a high-speed current switch driver based on MOS current-mode logic. The driver comprises: a MOS current-mode logic latch circuit for receiving current switch drive signals, and performing latching and amplitude limiting on the current switch drive signals so as to synchronize the current switch drive signals; a MOS current-mode logic current switch for receiving signals processed by the MOS current-mode logic latch circuit, generating current source drive signals with amplitude limited and adjusting crossing points of the current switch drive signals; and a common-source and common-gate current source with a NMOS switch for receiving the current switch drive signals processed by the MOS current-mode logic current switch and outputting low-distortion current signals, thus synchronizing the current switch drive signals and reducing feed-through effect.

Description

technical field [0001] The invention relates to a current switch driver in an analog integrated circuit, in particular to a low-noise, low-distortion MCML (MOS Current Mode Logic, MOS current mode logic) high-speed current switch driver. Background technique [0002] With the rapid development of integrated circuits and the widespread use of portable devices, low voltage, low power consumption, and high efficiency have become the development direction of today's integrated circuits. Reducing the power supply voltage is one of the effective ways to achieve low voltage and low power consumption, but it will reduce the speed of integrated circuit operation, and its noise will also have a more significant impact on chips working under low power supply voltage. [0003] MOS current-mode logic (MCML) is considered to have low power consumption delay and adjustable output swing, which can work at low supply voltage and obtain relatively excellent noise and speed performance. Curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/096
Inventor 朱樟明李光辉杨银堂王振宇刘帘曦
Owner 陕西光电子先导院科技有限公司
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