5 Mhz phase encoding
#NE592
#wide-band amplifier
#ac coupled amplifier
#common-mode rejection
#phase shift
#low-pass filter
#200 ohms
#5 Mhz
#phase encoding
Description: Readback data is applied directly to the input of the first NE592. This amplifier operates as a wide-band AC coupled amplifier with a gain of 100. By directly coupling the readback head to the amplifier, no matched terminating resistors are necessary, preserving the excellent common-mode rejection ratio of the amplifier. The DC components are also rejected since the NE592 has no gain at DC due to the capacitance across the gain select terminals. The output of the first stage amplifier is directed to a linear phase shift low-pass filter, which has a characteristic impedance of 200 ohms. The second NE592 functions as a low noise differentiator/amplifier stage. The output of the differentiator/amplifier is connected to the 8T20 bidirectional monostable unit to generate the appropriate pulses at the zero-crossing points of the differentiator.
The circuit described utilizes two NE592 operational amplifiers to achieve a high-performance signal processing system. The first NE592 is configured as a wide-band AC coupled amplifier, achieving a gain of 100. This configuration allows for the direct coupling of the readback data source, eliminating the need for matched termination resistors, which can introduce noise and affect signal integrity. The NE592's inherent design provides a high common-mode rejection ratio, ensuring that any noise present in the signal is minimized.
The absence of gain at DC is a significant feature of this circuit. The capacitance across the gain select terminals of the NE592 prevents DC signals from passing through, effectively rejecting any DC components that could interfere with the AC signal processing. The output of this amplifier feeds into a linear phase shift low-pass filter, characterized by a 200-ohm impedance, which is crucial for maintaining signal fidelity while filtering out high-frequency noise components.
The second NE592 is employed as a low noise differentiator/amplifier stage. This stage enhances the signal by differentiating the input signal, which is particularly useful in applications where rapid changes in signal amplitude need to be detected. The output from this differentiator/amplifier is then directed to the 8T20 bidirectional monostable unit. This unit is responsible for generating precise timing pulses aligned with the zero-crossing points of the differentiator output. This ensures that the system can accurately track and respond to changes in the input signal, making it suitable for high-speed data acquisition and processing applications.
Overall, the design effectively combines amplification, filtering, and pulse generation to create a robust signal processing pathway, ideal for applications requiring high sensitivity and low noise.Readback data is applied directly to the input of the first NE592. This amplifier functions as a wide-band ac coupled amplifier with a gain of 100. By direct coupling of the readback head to the amplifier, no matched terminating resistors are required and the excellent common-mode rejection ratio of the amplifier is preserved. The dc components are also rejected because the NE592 has no gain at dc due to the capacitance across the gain select terminals.
The output of the first stage amplifier is routed to a linear phase shift low-pass filter, with a characteristic impedance of 200 ohms. The second NE592 is utilized as a low noise differentiator/amplifier stage. The output of the differentiator/amplifier is connected to the 8T20 bidirectional monostable unit to provide the proper pulses at the zero-crossing points of the differentiator.
The circuit described utilizes two NE592 operational amplifiers to achieve a high-performance signal processing system. The first NE592 is configured as a wide-band AC coupled amplifier, achieving a gain of 100. This configuration allows for the direct coupling of the readback data source, eliminating the need for matched termination resistors, which can introduce noise and affect signal integrity. The NE592's inherent design provides a high common-mode rejection ratio, ensuring that any noise present in the signal is minimized.
The absence of gain at DC is a significant feature of this circuit. The capacitance across the gain select terminals of the NE592 prevents DC signals from passing through, effectively rejecting any DC components that could interfere with the AC signal processing. The output of this amplifier feeds into a linear phase shift low-pass filter, characterized by a 200-ohm impedance, which is crucial for maintaining signal fidelity while filtering out high-frequency noise components.
The second NE592 is employed as a low noise differentiator/amplifier stage. This stage enhances the signal by differentiating the input signal, which is particularly useful in applications where rapid changes in signal amplitude need to be detected. The output from this differentiator/amplifier is then directed to the 8T20 bidirectional monostable unit. This unit is responsible for generating precise timing pulses aligned with the zero-crossing points of the differentiator output. This ensures that the system can accurately track and respond to changes in the input signal, making it suitable for high-speed data acquisition and processing applications.
Overall, the design effectively combines amplification, filtering, and pulse generation to create a robust signal processing pathway, ideal for applications requiring high sensitivity and low noise.Readback data is applied directly to the input of the first NE592. This amplifier functions as a wide-band ac coupled amplifier with a gain of 100. By direct coupling of the readback head to the amplifier, no matched terminating resistors are required and the excellent common-mode rejection ratio of the amplifier is preserved. The dc components are also rejected because the NE592 has no gain at dc due to the capacitance across the gain select terminals.
The output of the first stage amplifier is routed to a linear phase shift low-pass filter, with a characteristic impedance of 200 ohms. The second NE592 is utilized as a low noise differentiator/amplifier stage. The output of the differentiator/amplifier is connected to the 8T20 bidirectional monostable unit to provide the proper pulses at the zero-crossing points of the differentiator.
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