KR20040016600A - Power supply stability circuit of high power amplifier - Google Patents

Abstract

PURPOSE: A power stabilizer circuit of a high-output amplifier is provided to perform stable amplification and enhance the matching compatibility of the input/output impedance by removing noise elements of a power supply. CONSTITUTION: A power stabilizer circuit of a high-output amplifier includes the second resistor(R2), a rectification circuit, the first noise elimination circuit(110), and the second noise elimination circuit(120). The second resistor(R2) is connected to the first resistor(R1) and the ground in order to divide the power inputted to a base of a transistor. The rectification circuit is connected between a power supply terminal and a collector of the transistor. The first noise elimination circuit(110) is connected between the rectification circuit and the collector of the transistor. The second noise elimination circuit(120) removes a DC and an AC noise element of the output signals of the transistor.

Description

Power supply stabilization circuit of high output amplifier {POWER SUPPLY STABILITY CIRCUIT OF HIGH POWER AMPLIFIER}

The present invention relates to a power supply stabilization circuit, and more particularly, to remove a noise component that may be applied to a power supply unit to increase stable amplification of a high output amplifier and matching compatibility of input / output impedance, and to supply a high output amplifier to stabilize isolation characteristics. It relates to a stabilization circuit.

Generally, in the conventional amplifier circuit, as shown in FIG. 1, the signal inputted through the first capacitor C1 passes through the first resistor R1 at the power supply terminal Vcc, and thus, at the first transistor TR1. Amplified and output through the second capacitor (C2). At this time, the third capacitor C3 is a power supply bypass capacitor and has a high capacity. On the other hand, these amplification circuits are used in two or three stages as high power amplifiers.

However, the conventional amplification circuit has a low noise figure because it cannot buffer the ripple of various power supplies introduced through the power supply terminal (Vcc) or the isolation characteristic of the amplifier itself and the current amplification degree of the transistor. It is difficult to expect the amplification of the amplifier, so in order to obtain the signal of the desired size, the amplification degree of the transistor is made as small as possible, and the amplification circuit is composed by connecting multiple stages, which makes the circuit bulky, which makes it difficult to design the circuit. There is a problem that the manufacturing cost is increased due to the use of.

Accordingly, an object of the present invention is to solve the above problems, and to remove noise components that may be applied to the power supply unit and to stabilize separation characteristics in order to increase stable amplification and matching compatibility of input / output impedance of a high output amplifier.

1 is a circuit diagram showing the configuration of a general amplifier circuit

2 is a circuit diagram showing the configuration of a power supply stabilization circuit of a high output amplifier according to the present invention.

<Description of the symbols for the main parts of the drawings>

C1 ~ C5: First to fifth capacitor D1: Diode

L1: first coils R1 to R4: first to fourth resistors

TR1: Transistor Vcc: Power Supply

110: first noise removing means 120: second noise removing means

Features of the present invention for achieving the above object,

A base connected to the power supply terminal and the input terminal for amplifying a signal inputted by a power source applied from the power supply terminal, a transistor having an emitter grounded to ground, and a base and power supply terminal of the transistor for supplying power to the transistor A first resistor connected in parallel between the first resistor, a first capacitor connected between the base of the transistor and an input terminal to block a signal of a DC component supplied from an input terminal, and a DC component of the signal output from the transistor to remove the DC component. An amplifier circuit comprising a second capacitor connected between a collector and an output terminal, and a third capacitor connected in parallel between the collector of the transistor and the power supply terminal to bypass the power supply.

A second resistor having one end connected in series and the other end grounded to ground so that power inputted to the base of the transistor is distributed through the power supply terminal;

Rectifying means connected between the power supply terminal and the collector of the transistor to rectify the power input to the collector of the transistor;

First noise removing means connected between the rectifying means and the collector of the transistor to remove noise of power input to the collector of the transistor;

And second noise removing means for removing DC and AC noise components from the signal output through the transistor.

Here, the rectifying means,

A cathode is connected to the power supply terminal and an anode is connected to the collector of the transistor.

Here, the first noise removing means,

A third resistor connected between the rectifying means and the collector of the transistor,

A first coil connected in series with a rear end of the third resistor;

One end is connected in parallel between the third resistor and the first coil, and the other end is composed of a fifth capacitor grounded to ground.

Here, the second noise removing means,

A fourth resistor connected between the emitter and the ground of the transistor,

One end is connected in parallel between the emitter and the fourth resistor, and the other end is composed of a fifth capacitor grounded to ground.

Hereinafter, the configuration of the power supply stabilization circuit of the high output amplifier according to the present invention will be described in detail with reference to FIG. In Fig. 2, the same parts as those in the amplifying circuit shown in Fig. 1 are given the same reference numerals as in Fig. 1.

2 is a circuit diagram showing the configuration of a power supply stabilization circuit of a high output amplifier according to the present invention.

2, the power supply stabilization circuit 100 of the high output amplifier according to the present invention includes a transistor TR1, a first resistor R1, a first capacitor C1, a second capacitor C2, And a third capacitor C3, a second resistor R2, a diode D1, a first noise removing means 110, and a second noise removing means 120.

The transistor TR1 is operated by a power source applied from the power supply terminal Vcc, and the base is connected to the power supply terminal Vcc and the input terminal to amplify the input signal, and the emitter is grounded to ground.

The first resistor R1 is connected in parallel between the base of the transistor TR1 and the power supply terminal Vcc to supply power to the transistor TR1, and the first capacitor C1 receives a signal of a DC component supplied from an input terminal. A second capacitor C2 is connected between a collector and an output terminal of the transistor TR1 so as to remove a DC component of a signal output from the transistor TR1 so as to cut off; The capacitor C3 is connected in parallel between the power supply terminal Vcc and the collector of the transistor TR1 to bypass the power supply.

The second resistor R2 has one end connected in series with the first resistor R1 so as to distribute the power input to the base of the transistor TR1 through the power supply terminal Vcc together with the first resistor R1. It is grounded to this ground.

The cathode of the diode D1 is connected to the power supply terminal Vcc so as to rectify power input to the collector of the transistor TR1, and an anode of the diode D1 is connected to the collector of the transistor TR1.

The first noise removing unit 110 includes a third resistor R3 connected between the diode D1 and the collector of the transistor TR1 to remove noise of a power source input to the collector of the transistor TR1 and a third resistor. A fifth capacitor C5 having one end connected in parallel between the first coil L1 connected in series with the rear end of R3 and the third resistor R3 and the first coil L1, and the other end grounded to ground. It consists of.

The second noise removing unit 120 includes a fourth resistor R4 connected between the emitter of the transistor TR1 and the ground so as to remove DC and AC noise components of the signal output through the transistor TR1, and the transistor TR1. One end is connected in parallel between the emitter and the fourth resistor (R4), and the other end is composed of a fifth capacitor (C5) that is grounded to ground.

Hereinafter, the operation of the power stabilization circuit of the high output amplifier according to the present invention will be described in detail with reference to FIG. 2.

When a signal is input to the base of the transistor TR1 through the first capacitor C1, the power applied from the power supply terminal Vcc is distributed through the first resistor R1 and the second resistor (1), thereby It is input to the base. Then, the transistor TR1 receiving the power is operated.

At this time, the power of the power supply terminal Vcc passing through the diode D1 passes through the first noise removing means 110 and then removes ripple and noise and is supplied to the collector of the transistor TR1.

In addition, DC and AC noise components are removed from the output signal through the second noise removing unit 120 and output through the second capacitor C2.

Therefore, since the stable voltage is supplied to the collector of the transistor TR1 by the third resistor R3, the first coil L1, the fourth capacitor C4 and the fifth capacitor C5, the transistor TR1 The noise is amplified and contributed, and the separation characteristic of the transistor TR1 itself is increased to facilitate input / output matching, and a stable signal can be output since the noise figure is low.

In addition, the power source rectified by the diode D1 and the distribution resistor composed of the first resistor R1 and the second resistor R2 absorbs the deviation of the current amplification degree of the transistor TR1 to allow constant amplification. Since the amplification of the transistor TR1 is stable, it can be easily matched with other components and can serve as a high output amplifier with little influence from interference of various noises.

As described above, according to the power stabilization circuit of the high output amplifier according to the present invention, in order to increase the stable amplification of the high output amplifier and matching compatibility of the input / output impedance, it is possible to remove noise components that can be applied to the power supply and to stabilize the separation characteristics. .

Claims (4)

A base connected to the power supply terminal and the input terminal for amplifying a signal inputted by a power source applied from the power supply terminal, a transistor having an emitter grounded to ground, and a base and power supply terminal of the transistor for supplying power to the transistor A first resistor connected in parallel between the first resistor, a first capacitor connected between the base of the transistor and an input terminal to block a signal of a DC component supplied from an input terminal, and a DC component of the signal output from the transistor to remove the DC component. An amplifier circuit comprising a second capacitor connected between a collector and an output terminal, and a third capacitor connected in parallel between the collector of the transistor and the power supply terminal to bypass the power supply. A second resistor having one end connected in series and the other end grounded to ground so that power inputted to the base of the transistor is distributed through the power supply terminal; Rectifying means connected between the power supply terminal and the collector of the transistor to rectify the power input to the collector of the transistor; First noise removing means connected between the rectifying means and the collector of the transistor to remove noise of power input to the collector of the transistor; And second noise removing means for removing DC and AC noise components from the signal output through the transistor. The method of claim 1, The rectifying means, And a cathode connected to the power supply terminal and an anode connected to the collector of the transistor. The method of claim 1, The first noise removing means, A third resistor connected between the rectifying means and the collector of the transistor, A first coil connected in series with a rear end of the third resistor; And a fifth capacitor having one end connected in parallel between the third resistor and the first coil and the other end grounded to ground. The method of claim 1, The second noise removing means, A fourth resistor connected between the emitter and the ground of the transistor, And a fifth capacitor having one end connected in parallel between the emitter and the fourth resistor and the other end grounded to ground.