High Speed Driver Amplifier
A drive amplifier, high-speed technology, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to improve efficiency, etc., can solve the problem of longer signal rising and falling edges, affecting circuit operating speed, and power consumption of the circuit Large and other problems, to improve the rising and falling edge time, low power consumption, speed up the effect of work
Active Publication Date: 2017-03-15
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology
[0003] However, there are two problems with the traditional method. The first is that the power consumption of the emitter follower circuit is very large. With the increase of the parallel emitter follower circuit, the power consumption increases sharply. The second is that as the scale of the load circuit increases, the load capacitance also increases. Increase, when the emitter-following circuit drives a capacitive load, the rising and falling edges of the signal become significantly longer, which affects the working speed of the circuit
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[0019] see figure 1 , which is a high-speed drive amplifier 100 provided in an embodiment of the present invention, which is used to amplify signals in a high-speed digital circuit. The high-speed drive amplifier 100 includes a drive amplifier circuit 120 and an acceleration circuit 140 . The drive amplifier circuit 120 includes a power supply terminal Vcc, two input terminals INP, INN and four output terminals 120c, 120d, 120e, 120f.
[0020] The acceleration circuit 140 includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5 and a first resistor R1. The acceleration circuit 140 includes two output terminals OUTP, OUTN and four input terminals, wherein the four input terminals of the acceleration circuit 140 correspond to the output terminals 120c, 120d, 120e, 120f of the driving amplifier circuit 120 .
[0021] The drive amplifier circuit 120 includes a differential amplifier circuit 122 and an emitter fol...
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The invention provides a high-speed drive amplifier which comprises a drive amplifying circuit and an accelerating circuit. The drive amplifying circuit comprises four output ends and a power supply end. The accelerating circuit comprises a first crystal triode, a second crystal triode, a third crystal triode, a fourth crystal triode, a fifth crystal triode and a first resistor, wherein the bases of the first crystal triode and the second crystal triode are respectively connected with two output ends of the drive amplifying circuit, the bases of the third crystal triode and the fourth crystal triode are respectively connected with the other two ends of the drive amplifying circuit, the collectors of the first crystal triode and the third crystal triode are connected with the power supply end, the emitter of the first crystal triode is connected with the collector of the third crystal triode, the emitter of the second crystal triode is connected with the collector of the fourth crystal triode, the emitters of the third and the fourth crystal triode are jointly connected to the collector the fifth crystal triode, and the emitter of the fifth crystal diode is grounded through the first resistor. By the accelerating circuit, the rising and falling edge time of output signals can be improved, and circuit working speed can be increased.
Description
technical field [0001] The invention relates to signal amplification technology, in particular to a high-speed drive amplifier. Background technique [0002] At present, in high-speed digital circuits, due to the influence of parasitics, the signal attenuation is very large, and the driving amplifier is an indispensable module. As circuit size and speed increase, driver amplifiers drive more differential pairs and require shorter rising and falling edge times. The traditional method is to increase the drive by connecting multiple emitter-follower circuits in parallel. [0003] However, there are two problems with the traditional method. The first is that the power consumption of the emitter follower circuit is very large. With the increase of the parallel emitter follower circuit, the power consumption increases sharply. The second is that as the scale of the load circuit increases, the load capacitance also increases. Increase, when the emitter-follower circuit is driving...
Claims
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IPC IPC(8): H03F1/02H03F3/45
Inventor 李维忠薛道均杨奇
Owner WUHAN POST & TELECOMM RES INST CO LTD