Signal transfer circuit and circuit device using same
a technology of signal transfer circuit and circuit device, which is applied in the direction of amplifiers, amplifiers with semiconductor devices only, amplifiers with semiconductor devices, etc., can solve the problems of reducing the stability of the circuit at high frequency, increasing the delay in phase at a high frequency, and increasing the speed and current feeding ability of pnp transistors
Inactive Publication Date: 2009-02-26
TEXAS INSTR INC
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Benefits of technology
The solution enables a push-pull buffer with improved stability and current driving ability, capable of handling large capacitive loads without significant phase delay or oscillation, thus enhancing high-speed operation.
Problems solved by technology
In a conventional semiconductor process, due to differences in structure, PNP transistors have a speed and current feeding ability inferior to those of NPN transistors.
As a result, the delay in the phase at a high frequency increases, and the stability of the circuit at high frequency decreases.
Especially, when a large capacitive load is connected to the output terminal OUT of the push-pull buffer, due to an increase in the phase delay due to the capacitive load and a decrease in the phase margin due to the increase in the phase delay at the collector mode of the Q3, oscillation may take place.
In addition, lower stability of the circuit of the buffer becomes a reason for difficulty in increasing the operating speed of the circuit operation.
Consequently, the conventional push-pull buffer circuit can hardly be used in applications with a large capacitive load connected.
As a result, the current driving ability of the buffer becomes lower, and this is undesired.
Consequently, the aforementioned problem cannot be solved.
Method used
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[0028]According to the present invention, it is possible to provide a type of signal transfer circuit that has a low impedance and a wide dynamic range of current. By means of this signal transfer circuit, it is possible to realize both high circuit stability and a high current driving ability (a wide dynamic range of the output current), which have formerly had a trade-off relationship with each other. In addition, this can be realized by means a simple circuit configuration, so that it is possible to cut the cost.
[0029]FIG. 1 is a block diagram illustrating a signal transfer circuit A in an embodiment of the invention. As shown, signal transfer circuit A has a voltage-current converter 1, a current transfer circuit 3, and a current-voltage converter 5. The current transfer circuit 3 has a current transcription circuit 30 and an output current path 32. Voltage-current converter 1 receives a signal in voltage form as input and converts the voltage to a current, so that a signal in c...
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A signal transfer circuit appropriate for use in realizing both high circuit stability and high current driving ability is disclosed. Signal transfer circuit A has current transfer circuit 3 that transfers a signal current via first reference current I1. In one embodiment, current transfer circuit 3 has current transcription circuit 30 that transcribes signal current Is to first current portion I1-1 of first reference current I1, and output current path 32 that transfers the first current portion I1-1. In one embodiment, current transfer circuit 30 has first current branching circuit 300 and second current branching circuit 302.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional patent application that claims benefit of U.S. patent application Ser. No. 11 / 238,004, filed Sep. 28, 2005, and to Japanese patent application serial number 2006-242489, filed Sep. 26, 2006, and claims priority to Japanese patent application serial number 2004-281027, filed Sep. 28, 2004. All of which are herein incorporated by reference.[0002]The present invention relates to a signal transfer circuit, and to a push-pull circuit or other circuit device using such signal transfer circuit.BACKGROUND[0003]In a conventional semiconductor process, due to differences in structure, PNP transistors have a speed and current feeding ability inferior to those of NPN transistors. Consequently, when a push-pull buffer is formed in this process, usually only NPN transistors are used in the output stage.[0004]FIGS. 9 and 10 show examples of the circuit configuration of push-pull buffers in the prior art. The output stage...
Claims
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IPC IPC(8): H03F3/26H03F3/04
CPCH03F3/30H03F1/34
InventorTAKAHASHI, AKIRA
OwnerTEXAS INSTR INC