A new Guzik Head Amplifier Active Injector has bandwidth from DC to 6 GHz and provides a differential output signal with high symmetry of frequency response and group delay. This signal injector is required for frequency response measurements of high bandwidth analog front-end integrated in the Guzik test system.

The injector bandwidth starts from DC to measure frequency response of read-back amplifiers for perpendicular recording. The injector converts the single-ended signal from a network analyzer or a signal generator to a differential signal and attenuates the level of the signal, so it can be connected to the input of a head amplifier.

Items available: CCW Cartridge with Active Injector Board (Guzik P/N S80-702376), CW Cartridge with Active Injector Board (Guzik P/N S80-702373), and Power Filter Cable (Guzik P/N 30-461017). Separate Injector Boards CCW (Guzik P/N 23-323080) and CW (Guzik P/N 23-323000) can be ordered as spare parts.

Specifications

• Bandwidth: DC to 6GHz (–3dB)
• Flatness: ± 0.5dB, DC to 5GHz
• Amplitude Difference Between Positive and Negative Outputs:
  less than 0.5 dB

• Flatness: better then 100 psec to 6GHz
• Difference Between Positive and Negative Outputs:
  less than 25 psec

Output Impedance

• Nominal: 50 Ohm

Attenuation

• Single Ended Input to Differential Output: 36dB nominal

• ± 5V, 120mA from the power filter of RWA Analog Box

Frequency Response and Group Delay

Figure 1: Frequency Response of Head Amplifier Active Injector

Figure 2: Group Delay of Head Amplifier Active Injector