ASNT6124-BD View full size
  • Broadband transimpedance amplifier (TIA) for low noise receiver-side applications
  • Automatic and/or manual output amplitude control
  • Automatic DC offset adjustment
  • Input peak detector
  • On-chip temperature detector
  • Exhibits low jitter and limited temperature variation over industrial temperature range
  • Fully differential input and output buffers with on-chip 50Ohm termination
  • Single +3.3V or -3.3V power supply
  • Low current consumption of 240mA at nominal conditions
  • Fabricated in SiGe for high performance, yield, and reliability
  • Unpackaged bare die

Function Operating Frequency Power, mW Package
Transimpedance Amplifier with Linear Amplifier and Automatic Gain Control Die DC-28 Gbps 776 Not Packaged


Fig. 1 Functional Block Diagram

The ASNT6124-BD SiGe IC is a temperature stable SiGe transimpedance amplifier that provides low-jitter broadband linear conversion of current signals at its input ports (inp/inn) into differential voltage signals at the output ports (outp/outn). The part is a serial combination of transimpedance (TIA), linear (LA), and output (OA) amplification stages. The input signal can be either differential or single-ended with the current always flowing into the corresponding pin. In case of one input being single-ended, a certain DC level signal must be applied to the other input. The part incorporates an automatic DC offset control (OSC) that effectively eliminates any difference between the common-mode voltages of direct and inverted output signals. This function requires utilization of an external 30nF capacitor attached to cfilt pad. 


The amplitude of the output signal can be manually adjusted between its minimum and maximum values using the ampadj control input. The output amplitude can be stabilized by the Automatic Amplitude Control block which is activated by setting the control signal agcoff to logic “0” state. In this operational mode, the amplitude can be also additionally adjusted through control input agccont. The on-chip peak detector (PD) provides an output signal pkdet proportional to the value of the input signal. The part’s outputs support a CML-type interface with on-chip 50Ohm termination and may be used as a differential or single-ended connection with AC or DC-coupling (see also Power Supply Configuration within the part's datasheet). The input and output termination resistors in both channels are respectively connected to separate internal positive supply plains vcct and vcc. The input and output negative supply nets are also created as separate metal plains veet and vee, which are partly shorted through the common substrate.

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