SU964971A1

SU964971A1 - Parametric amplifier

Info

Publication number: SU964971A1
Application number: SU782675814A
Authority: SU
Inventors: Владимир Николаевич Куликов
Original assignee: Предприятие П/Я Г-4173
Priority date: 1978-10-17
Filing date: 1978-10-17
Publication date: 1982-10-07

Description

Изобретение относитс к области радиотехники и может быть использовано в радиоприемниках и спектроанализаторах .The invention relates to the field of radio engineering and can be used in radio receivers and spectrum analyzers.

Известен параметрический усилитель , содержащий три индуктивно св занные между собой катушки индуктивности , две из которых включены . соответственно во входной и выходной ко иJtJaтeльныe контуры, а также параметрический элемент и генератор накачки 1 .A parametric amplifier is known that contains three inductively coupled inductor coils, two of which are included. respectively, in the input and output coils, and the JtJa circuits, as well as the parametric element and the pump generator 1.

Однако известный параметрический усилитель обладает низким устойчивым коэффициентом усилени .However, the known parametric amplifier has a low steady-state gain.

Цель изобретени - увеличение.устойчивого коэффициента усилени .The purpose of the invention is to increase the stable gain.

Поставленна цель достигаетс тем, что в параметр-ическом усилителе параметрический элемент подключен одним концом через третью катушку индуктивности, а другим концом через генератор накачки в общей шине.The goal is achieved by the fact that in the parametric amplifier the parametric element is connected at one end through a third inductor and the other end through a pump generator in a common bus.

Кроме того параметрический элемент выполнен в виде электрически управл ег юго резистора.In addition, the parametric element is designed as an electrically controlled resistor southwest.

На чертеже представлена принципиальна схема параметрического усилител ,The drawing shows a schematic diagram of a parametric amplifier,

4four

Параметрический усилитель содержит входной 1 и выходной 2 колебательные контуры, а также контур 3 св зи.The parametric amplifier contains input 1 and output 2 oscillatory circuits, as well as communication circuit 3.

Контуры 1 и 2 образованы соответственно емкост ми 4 и 5 и индуктивност ми 6 и 7, а контур 3 - индуктивностью 8 и параметрическим элементом 9.Loops 1 and 2 are formed by capacitances 4 and 5 and inductors 6 and 7, respectively, and loop 3 by inductance 8 and parametric element 9.

10ten

Индуктивности б, 7 и 8 индуктивно св заны между собой.Последовательно с индуктивностью 8 и параметрическим элементом 9 включен генератор 10 накачки.Inductances b, 7, and 8 are inductively coupled to each other. The pump generator 10 is switched on in series with inductance 8 and parametric element 9.

1515

В качестве параметрического элемента 9 может быть использована электрически упрсВл ема емкость (варикап ) или управл емый резистор (варистор , полупроводниковый диод, оп20 трон и т .п.).As a parametric element 9, an electrically operated capacitance (varicap) or a controlled resistor (varistor, semiconductor diode, opron, etc.) can be used.

Параметрический усилитель работает следующим o6pa3ONf.Parametric amplifier works as follows o6pa3ONf.

При модул ции сигналом накачки параметрического элемента 9 полное When the pump signal modulates the parametric element 9, the full

25 сопротивление контура 3 св зи периодически измен етс , что приводит к периодическому (с частотой накачки) изменению коэффициента св зи между контурами 1 и 2. Если при этом в 25, the resistance of communication circuit 3 periodically changes, which leads to a periodic (with the pump frequency) change in the coupling coefficient between circuits 1 and 2. If

Claims

In circuit 30, there is a signal whose frequency coincides with the tuning frequency of this circuit, and the combination frequency, for example, is equal to the pump and input frequencies, coincides with the tuning frequency of the output circuit 2, then with a sufficient depth of modulation of reactivity (in this case mutual induction related to the coupling coefficient) according to the theory of the parametric NIN gain in the proposed amplifier, the gain of the input signal can be obtained, and the gain in the maximum stable gain Avl and, where u) k. and (jUc, respectively, are the combination and signal frequencies. Thus, the proposed inclusion of a parametric element between the pump generator and the coil, inductively connected to the inductance of the input and output oscillatory circuits, allows increasing the stable coefficient - The amplifications of the proposed parametric amplifier are several times greater and the greater, the more the combination frequency exceeds the signal one. 1. Parameter amplifier containing three inductively coupled inductor coils, two of which are included respectively in the input and output oscillatory circuits, and a parametric element and pump generator, different in that in order to increase the stable gain , the parametric element is connected at one end through a third inductance coil, and the other end through a pump generator to a common bus.

2. Amplifier pop.1, distinguished by the fact that the parametric element is designed as an electrically controlled resistor. Sources of information taken into account during the examination 1. Fridolin GG Parametric amplifiers. M., TsNIIPI, 1964, p.10, (prototype).