PRL-860D: Dual Channel 10X In-Line Signal Monitor/Low-Loss Pickoff Tee

Mini Modular Instruments > Splitters > PRL-860D

Applications:

• In-Line GHz ECL and RF Signal Monitoring
• Differential Signal Monitoring
• Permanent In-line Installations for System Monitoring
• Trigger Pick-Off Signal Generation

Features:

• Dual Channel for CLK/DATA Monitoring
• SMA I/O, 50 Ω Impedance
• Through Port Bandwidth > 7 GHz
• Monitor Port Bandwidth > 6 GHz
• Through Port Retains 95% of Input Signal (0.42 dB insertion loss)
• Monitor Port Retains 10% of Through Signal (20 dB attenuation ratio)
• Applicable to Single-Ended or Differential Inputs

Description:

The PRL-860D is a dual channel wideband signal splitter, intended for inline signal monitoring applications. As shown above, the input signal travels from Input Port D to the Through Port Q_T via a 50 Ω transmission line. A small fraction of the input signal is extracted by the 450 Ω resistor and diverted to the Monitor Port Q_M. A typical connection set up is shown in Fig. 1. The signal generator with a source resistance R_S is connected to Port D, and Q_T is connected to the intended load R_L. Q_M, which monitors the input signal going through Q_T, is connected to a 50 Ω input scope.

When operating in a 50 Ω environment, typically 95% of the input signal applied to port D is transmitted to port Q_T and 10% to port Q_M. For optimum inline monitoring performance, Q_M must always be connected a 50 Ω-input instrument. Q_T, however, can be left open or connected to an arbitrary load, because it is the function of the Q_M port to capture the input signal when it is going through the Q_T port. For example, if Q_T is left open, Q_M will display the input signal at the end of a transmission line terminated into 500 Ω. More detailed discussion on this subject will be made available on our website.

From Fig. 1, before Q_M is connected to the scope, the Thevenin output impedance Z_TH looking into the 50 Ω Z₀ bus is simply R_S//R_L, and the Thevenin output voltage measured at the same point is V_TH. After Q_M is connected to the scope, the equivalent circuit is shown in Fig. 2, where Z_TH and V_TH are given in Fig.1. Fig. 2 is intended for DC calculations only, as it does not include the interconnecting cable between Q_T and the load R_L. For a given input V_S, the Through port voltage V_QT and the Monitor Port voltage V_QM can be calculated as follows:

Fig. 1. Typical Set Up	Fig. 2. Simplified Equivalent Circuit of Fig. 1

From Fig. 2, VQT = VTH x 500/( ZTH + 500) If RS = RL = 50 Ω, then, ZTH = 25 Ω, and VTH = VS/2, or 0.5 VS. Using these values of ZTH and VTH in (1)		(1)
VQT =0.476 VS		(2)

Equation (2) states that, after loading the Q_M port, the Through Port output is reduced to 0.476/0.5 = 95.2% of V_TH, the unloaded value. From Fig. 2, V_QM is simply 0.1 V_QT, due to the 450 Ω/50 Ω, 10 to 1 divider.

There will be four models in the PRL-860 series:

• PRL-860D-SMA, 2 SMA Inputs, 2 SMA Through Ports, 2 SMA Monitor Ports, available now
• PRL-860D-TR, 1 Triax Input, 1 Triax Through Port, 2 SMA Monitor Ports, coming soon
• PRL-860Q-SMA, 4 SMA Inputs, 4 SMA Through Ports, 4 SMA Monitor Ports, for simultaneous CLK/Data monitoring, coming soon
  • This unit comprises two identical PCBs in one enclosure, and therefore is functionally equivalent to two units of PRL-860D-SMA.
• PRL-860Q-TR, 2 Triax Inputs, 2 Triax Through Ports, 4 SMA Monitor Ports, for simultaneous CLK/Data monitoring, coming soon

**All prices are for U.S. orders only. For export orders, please add 15%. Prices subject to change without notice. Please consult factory for additional information at +1-310-515-5330 or sales@pulseresearchlab.com**

PRL-860D | Detail | Diagram | Specifications | Test Results | Datasheet