KR830002447A - Bridge amplifier - Google Patents

Abstract

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Description

Bridge amplifier

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1 is a diagram of an amplifier embodying the present invention.

FIG. 2 is a diagram showing part of the circuit in FIG. 1 separately for illustrative purposes.

FIG. 3 is a cross-sectional view that greatly enlarges a portion of the amplifier of FIG. 1 made of an integrated circuit.

4 is a block diagram of a circuit to be used in a telephone in which the circuit according to the present invention is used.

FIG. 5 is another diagram indicating which elements of FIG. 4 appear outside the integrated circuit chip.

Claims (11)

It is connected to the 2-wire line forming both the first signal input and the first signal output. The DC current supply of the amplifier is received on a two-wire line, and the emitters of these transistors are connected together and connected to a first common point, including first and second transistors in which the collectors are respectively connected to the two lines of the line. , The amplifier also includes third and fourth transistors, the collector of which is connected to the two lines of the line respectively, the bases of these transistors are connected together and connected to a second common point, the resistance impedance of which is between the first and second common points. Connected to, the relative polarities of the first and second common points are the same regardless of the polarity of the two wires of the line, and the second signal output from the amplifier is taken from the resistance impedance and appears in the signal resistance impedance received through the line. , A bidirectional amplifier in which a second signal input to the amplifier is applied to the base of the first and second transistors, so that a signal applied to the base of the first and second transistors is applied from the amplifier to the line. The emitters of the third and fourth transistors are respectively connected to the third common point via the second and third terms, and the third common point provides a DC voltage output point, and a capacitor is provided between the second and third common points. An amplifier as claimed in claim 1 which is connected. The first and second transistors are essentially similar to each other, and the third and fourth transistors are essentially similar to each other, and the first and second transistors are larger in size than the third and fourth transistors, and thus the third or jet transistors. Any one of the amplifiers claimed in claim 1 or claim 2 that is conducted in a saturated state when conducting. The amplifier as claimed in claims 1, 2 or 3, wherein the amplifier is made of an integrated circuit device, and the third and fourth transistors are surrounded by a field barrier in which the integrated circuit floats in the substrate. The collector connection of the transistor is connected to a line wire, and transmission is passed through an additional amplification device to the second signal input, and the second signal output is drawn from the resistance impedance and then passed through an additional amplification device to a receiver. An electronic circuit used in the telephone of a telephone subscriber that includes an amplifier as claimed in claims 1, 2, 3 or 4 which are connected. An electronic circuit as claimed in claim 5, wherein a feedback loop for gain control purposes extends from a second output point to a point between the transmitter and the amplifier, the feedback loop including the differential amplifier to become an active feedback loop . Claims, including voice frequency "dialing" and the imminent force through which other signals may be received via other signals, and connections from that additional differential amplifier that do not mute the input from the handset during the ringing process. Electronic circuit claimed in 5 or 6. An electronic circuit as claimed in claims 5, 6 or 7, including a connection comprising an additional bridge from the line from which the amplification is controlled and the DC output is obtained to the receiving circuit element. Bidirectional amplifier as described with reference to FIGS. 1 and 2 of the accompanying drawings. Bidirectional amplifier as described with reference to FIGS. 1, 2 and 3 of the accompanying drawings. An electronic circuit used on the telephone of a telephone subscriber as described with reference to the accompanying drawings. ※ Note: Disclosure is based on the original application.