Solid laser range finder reception circuit

Description: The amplification of this circuit is approximately 12,000 times, with a bandwidth ranging from 0.5 to 14 MHz. The input resistance is 700 ohms, while the output resistance is 35 ohms (measured at 5 MHz). The output noise level is between 0.6 and 0.8 volts. In the schematic, transistors T1 and T2 function as direct coupling amplifiers, configured with parallel current negative feedback. The Zener diode 2CW11 enhances the emitter level of T2.

This circuit exemplifies a high-gain amplifier designed for applications requiring significant signal amplification with a wide bandwidth. The gain of 12,000 indicates that the circuit is suitable for low-signal applications, where even minute input signals can be amplified to usable levels. The specified bandwidth of 0.5 to 14 MHz suggests that the circuit can handle a variety of signal frequencies, making it versatile for different electronic applications.

The input resistance of 700 ohms is relatively high, allowing for minimal loading on the preceding stage, which is crucial in maintaining signal integrity. Conversely, the output resistance of 35 ohms, measured at 5 MHz, indicates a low output impedance, which is beneficial for driving subsequent stages or loads without significant loss of signal strength.

The direct coupling configuration of transistors T1 and T2 allows for efficient signal transfer between stages without the need for coupling capacitors, which can introduce phase shifts and frequency response issues. The parallel current negative feedback employed in this design stabilizes the gain and improves linearity, thus reducing distortion and enhancing overall performance.

The inclusion of the Zener diode 2CW11 serves a critical role in regulating the emitter voltage of transistor T2, ensuring that the transistor operates within its optimal range. This regulation helps to maintain consistent performance across varying operating conditions and contributes to the stability of the amplifier.

Overall, this circuit design is well-suited for applications in audio amplification, RF signal processing, and other areas where high gain and low noise are essential.The amplification of this circuit is about 12000 times, the bandwidth is 0.5~14MHz, the input resistance is 700?, the output resistance is 35?(measured with 5MHz), the output noise level is 0.6~0.8V. In figure, T1, T2 are direct coupling amplifier, they are connected into parallel current negative feedback.

Zener diode 2CW11 improves T2 emitter level, i..