SU561277A1 - Microwave amplifier - Google Patents

Description

I

The invention relates to radio engineering and can be used in radio-frequency microwave devices.

A microwave amplifier is known, comprising two transistors connected in cascade form.

However, an elegant amplifier does not have sufficient stability of the work.

The purpose of the invention is the expansion of the operating frequency range.

For this, in a microwave amplifier containing two transistors connected in cascade, the collector of the first transistor is connected to the collector. The second transistor is through a series-connected coil inductance and a times., dividing capacitor.

The drawing shows a circuit diagram of a microwave amplifier.

The proposed amplifier contains two transistors 1,2 connected in a cascade circuit. The collector of the transistor 1 is connected to the collector of the transistor 2 through a series-connected inductor 3 and a coupling capacitor 4.

The highlight of the Idactivity is chosen so that at the upper operating frequencies of the amplifier the equality is ensured

rl11 (

corp

where LI is the inductance of the coil 3 j

f is the limiting frequency amplified by the current of the transistor 2;

C | - collector junction capacitance - without transistor 2;

C - capacitance between the output of the emitter-collector of the transistor 2.

The proposed amplifier works as follows.

The inductor 3, which is the feedback element, significantly reduces the inductance of the input resistor of the cascade. - with a common base. Thereby, the upper working frequency of the amplifier increases, since this frequency is equal to the resonant frequency of the circuit,

The output stage of the cascade with a common emitter and 1 output power is the input of the corresponding sipro of the cascade with a common base. On the other hand, the SURFACE, inductance 3, KOMJieHCvipya paraant} the effect of capacitance C of the cascade with a common base increases the stability of the device.

Claims (1)

Invention Formula Amplitude of ultra-high frequencies, containing two transistors, connected in a kOKadnu scheme differs in that with the aim of extending the range of pa. Frequency, the collector of the first transistor is connected to the collector of the second transistor. ra through successively connected K. shank inductance and separation capacitor. The source of information accepted in the BNI opinion of the invention: 1, Kovalev V.N. Correction of the frequency response of an amplifier such as common emite ter - common base. Radv ote shka 1974, № 4. k Hh Bjfod 0 Output -HZJ