Four analog amplifiers on two digital CMOS chips. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Four analog amplifiers on two digital CMOS chips. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Radio amateur designer

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The described device can be used in amateur radio designs as a quad analog inverting amplifier with a high gain.

The amplifier can be powered by a unipolar voltage of 3 ... 15 V. The gain is about 1000 with an input resistance of at least 10 MΩ. Input voltage ranging from zero to supply voltage does not cause damage to the input chip. The output voltage limits are the same. The frequency band without additional correction reaches several megahertz.

The node is built on two microcircuits (Fig. 1). The linear mode of operation of the amplifier is provided by the inclusion of a feedback resistor between the output and input.

Four analog amplifiers on two digital CMOS chips

The use of a CMOS gate as an analog amplifier is attractive for at least several reasons. Compared to a widely used op-amp, firstly, the input impedance of such an amplifier is much larger, therefore, if necessary, it is permissible to use high-resistance resistors in OS circuits. Secondly, the bandwidth of the uncorrected CMOS amplifier is much wider, and the frequency response is uniform over a wider frequency band. Thirdly, it does not require bipolar power. The fourth factor is its versatility. The CMOS amplifier can also operate in the standard mode, i.e. as a digital element. The second inputs of the elements can be used to strobe (turn on and off) the device.

The amplifier inputs are protected by built-in diodes, which, when a current-limiting resistor is included in the input circuit, provides significant overload capacity. Finally, since digital microcircuits consist of several logical elements, the radio amateur receives up to four CMOS amplifiers at once.

The choice of microcircuits used in the node is not accidental. The K561LP2 includes eight inverters, which are connected in pairs in series inside the microcircuit according to a signal, which, other things being equal, reduces the number of necessary external connections, and hence parasitic capacitances. To ensure the analog mode, part of the inputs of the elements of both microcircuits must be connected to a common wire. The K561LE5 chip is good here. that its "grounded" conclusions have the same numbers as those of K561LP2.

All this makes it possible to mount both microcircuits on the board in such a way that they will occupy the space allotted for one fourteen-pin case: they are installed in two floors, folded over and some of their pins are soldered, as shown in Fig. 2. Of course, the standard mounting of microcircuits is not excluded.

Four analog amplifiers on two digital CMOS chips

If it is necessary to correct the frequency response of a separate amplifier, it is permissible to shunt the output of the logic elements of the DD1 microcircuit with a capacitor with a capacity of up to 1000 pF.

Author: A.Samoilenko, Klin, Moscow Region

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Amplifiers are not CMOS logic elements - an interesting topic. In many cases, they can replace conventional transistors. That's just the gain (in the article = 1000) for two CMOS connected in series is actually from 100 to 400. (Gain of one = 20-26dB).

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