JPH032676A - Full-wave rectifier circuit - Google Patents

Abstract

PURPOSE:To obtain a full-wave rectifier circuit with a high accuracy by including two differential couples for performing a half-wave rectification and an emitter coupling circuit for adding a half-wave rectification waveform thereof. CONSTITUTION:A signal is inputted at points (p) and (g) from a signal source Vin 1 through C1 and C2 of a capacitance element 3 and when voltages at the points (p) and (g) are set at Vp and a Vg, the Vp and Vg give waveforms of an opposite phase. Then, when signals at the points (r) and (s) are Vr>Vs (initial half cycle) with an emitter coupling circuit by Q5 and Q6 of an output transistor 11, the Q5 of the output transistor 11 is turned On and the Q6 thereof turned OFF. When VOUT = Vr-VBE = Vp->VBE, Vs>Vr (subsequent half cycle), the Q5 of the output transistor 11 is turned ON and the Q6 thereof is turned OFF and VOUT = Vs-VBE = Vg-<VBE to present a full-wave rectification waveform as indicated by VOUT is produced.

Description

[Detailed description of the invention] [Industrial application field] With this invention, all the materials used in semiconductor integrated circuits , concerning the leisure wave current circuit.

[Prior Art] Fig. 3 is a circuit diagram showing a conventional full-wave rectifier circuit. A capacitive element for passing the alternating current component of the signal source Vln Ill (41 is an input transistor whose collector and emitter are connected to form a differential pair, 5
) is a resistance element that supplies DC voltage to the base terminal of the input transistor (41 Q7e Qa), (61 is a resistor connected between the collector of the differential pair by the input transistor (41 and the voltage source Q51 of this circuit) Element, +71#j
A resistor element connected between the emitter of the differential pair by the input transistor 14) and ground, an output transistor whose base is connected to the collector of the differential pair by the input transistor 14), a +91H output transistor (8 )
A constant current source connected to the emitter of

Next, the operation will be explained. FIG. 4 (&) to (fl are waveform diagrams showing waveforms at each point in the full-wave rectifier circuit in FIG. 3. At points χ and y shown in FIG. 3, signal sources Via I
When a signal enters from ll through the capacitive elements +31 as and a4, and the voltages at the χ point and y point are yz and v, respectively, vz and vy are expressed as shown in Figure 4 (a, +, (bl)). The waveform is of opposite phase.

When Vχ>Vy (first half cycle), Ql of input transistor (41) is ON, Qa of input transistor (4)
is turned OFF, and the resistance element 161 Ra and the resistance element (
7) Adjust the current flowing through R7f, respectively.6. F, input transistor (41 base-emitter voltage iVma, then 6.F is Vχ -VBI 6!F-hill) Also, the voltage f at the two points shown in Fig. 8? ! :V*, when the voltage applied to the voltage source Q51 is Vaa, and the output voltage is VOUT, Vz and vQσT are as follows.

If V, > Vχ (next half cycle) then input transistor 1
Qa of 4) is ON, Ql of input transistor (4) is O
FF becomes Y-VBz Engineering 6 brutal F m11-----Vz, Vot+r is VzmVcc- Engineering a F6- Vcc --(Vr-V
BE) Therefore, VOI7T has a full-wave rectified waveform as shown in FIG. 4(f+).The waveforms of lI6.F%7z are as shown in FIG.

Note that '17biae shown in FIG. 4 is the voltage of the DC voltage source (2).

[Problem to be solved by the invention]

Since the conventional full-wave rectifier (b) path is constructed as described above, it has had problems such as variations in the output amplitude due to variations in the resistance ratio.

This invention was made to solve the above problems, and is a high-precision full-wave rectifier circuit. The purpose is to obtain.

[Means to solve the problem]

A full-wave rectifier circuit according to the present invention includes two differential pairs that perform half-wave rectification and an emitter coupling circuit that adds the half-wave rectified waveforms.

[Effect]

Full wave in this invention! The fi circuit adds half-wave rectified waves that have been half-wave rectified by two differential pairs using an emitter coupling circuit, and outputs the sum as a full-wave rectified waveform.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a circuit diagram of a full-wave rectifier circuit.

In the figure, 111 to (41) are the same as those shown in the conventional example of FIG. 8, so their explanation will be omitted.

tlol i The first differential pair with Ql, Q, 2 of the human-powered transistor 14) and the input transistor (Q, 3 of 41)
, a resistance element for supplying DC voltage to the base terminals of the transistors of the second differential pair by Qa, αυ
Q1, Q2 of the human-powered transistor 141 and the first differential pair Q3 of the input transistor 14). The base is connected to the emitter of @2 differential pair by Q4VC,
Emitter-coupled output transistors, +121 are constant current sources n connected to the emitter terminals of the first differential pair by Q1, Q2VC, and Q3. Constant current source 2 connected to the emitter terminal of the second differential pair by QaVC, a41r
This is a constant current source 3 connected to the emitters of Q5 and Qa of the output transistor α.

Next, the operation will be explained. FIG. 2 (8L1 to tel is a waveform diagram showing the waveform at each point in the full-wave rectifier circuit in FIG. 1. At points p and g shown in FIG. 1, the signal source Vin
From Ill, Ox, C! of capacitive element (3)! A signal enters through 2, and the voltage at point p and point g respectively;/'t Vp
, when vg and f, Vp, vg is fat as shown in Figure 2,
In particular, the waveform shown in iJ is of reverse phase.

If vp>vg (first half cycle), input transistor +
41 Ql, Q3 is ON, input transistor +4 Q2. When Q and 4 are OFF and the voltages at point r and point 8 shown in Fig. 1 are Vr and Ve, respectively, Vr - Vp
-WEE Vday = Vbias -VBE Vg ) Vp (next half cycle), then Q2. Cl3 is ON, input transistor (
When Ql and Q3 in 4) are OFF', at points r and 8, Vr = Vbiaa -VBE V day ■ v(-VBE.Next, the signals at points r and S are output to the output transistor aυ
Q5+Q', the emitter coupling circuit allows Vr
)Ve (first half period), the output transistor αυ
Qa 7j: ON, Qa turns OFF and VOI
7T −Vr −VBE” vp −2VB
When gV day > Vr (next half cycle), Q5 of the output transistor 111) turns ON, Qa turns OFF, and VOUT
-vB -VBK -Vg-Z, VBE becomes the second
A full-wave rectified waveform like voaT shown in FIG. 10j is obtained.

The waveforms of Vr and Ve are shown in Fig. 2, 10j and +, respectively.
As shown in dl.

In addition, in the above implementation column, a differential pair of input transistors 14)
and emitter-coupled output transistor GIJ to NP
N) Although a transistor using a transistor is shown, a PNP transistor may be used.

[The fruit of invention]

As described above, according to the present invention, a highly accurate full-wave rectifier circuit with no variation in output amplitude can be obtained because it is configured with two sets of differential pair seven-emitter coupling circuits.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a full-wave rectifier circuit according to an embodiment of the present invention, FIG. 2 tal to tel are R-shaped diagrams showing signal waveforms at each point of the circuit in FIG. FIG. 4 is a circuit diagram showing the full-wave rectifier circuit of FIG. 31 is a capacitive element, (4) is an input transistor, (1o)
is a resistance element, UU is an output transistor, 0 power is a constant current source Iz, 04 is a constant current source 12, α4 is a constant current source xs
, g~ is the voltage source input. In addition, in FIG. 1, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] a first differential pair in which the collector terminals of the pair of input transistors are connected and the emitter terminals are connected; and a second differential pair having the same configuration as the first differential pair. a first output transistor whose base terminal is connected to the emitter terminal of the first differential pair; a second output transistor whose base terminal is connected to the emitter terminal of the second differential pair; A full-wave rectifier circuit characterized in that an emitter terminal of an output transistor and an emitter terminal of a second output transistor are connected to form an emitter-coupled circuit.