PA243DF

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PA243DF Application Field and Working Principle

The PA243DF is categorized under Linear - Amplifiers - Instrumentation, OP-Amps, Buffer Amps. It is a high-performance differential amplifier, designed for use in providing gain control in wide range applications where high linearity and wide-bandwidth operation is required.

PA243DF is a differential amplifier designed using proprietary BiCMOS and CMOS technologies. The two inputs are biased with a single positive reference current. The integrated circuit design allows for a low input common-mode voltage range, reduced parasitic capacitance, and minimal power consumption.

Applications

The PA243DF is utilized in a variety of applications that demand high linearity, low noise, and wide bandwidth performance. These applications include:

• Automatic Gain Control (AGC)
• Radio and TV broadcast receivers
• High-speed digital data receivers, such as for communication and satellite systems
• Telephone hybrid networks
• Base station radio receivers

Working Principle

The PA243DF is designed to be used as a differential amplifier for applications that require high linearity and wide-bandwidth operation. The input bias current is determined by the ratio of the current source resistors and the reference current. The output stage is composed of a class AB output amplifier configuration. The output stage consists of two stages, each of which consists of an operational amplifier to ensure low distortion, wide bandwidth and low noise performance. The PA243DF also includes a differential-mode feedback circuit that provides improved input stage linear characteristics. The differential-mode gain is determined by the ratio of the voltage followers and the feedback resistors.

The PA243DF has two adjustable gain control pins. These pins can be used to control the DC or AC gain of the amplifier. They both work by adjusting the differential-mode gain of the input stage. The DC gain control allows the user to vary the quiescent current of the amplifier to adjust the DC gain, while the AC gain control adjusts the frequency response.

The PA243DF is a versatile high-performance amplifier with a wide input common-mode voltage range, low power consumption and low noise. It is ideal for applications where high linearity and wide-bandwidth operation are essential, such as radio and television broadcast receivers, high-speed digital data receivers, telephone hybrids, and base station radio receivers.

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