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An RF/microwave balun (or transformer) is a device that takes an input signal at a given impedance and outputs both the same signal and an inverted version of the signal at a (potentially) different output impedance. They are suitable for applications in differential signaling, integrated circuit testing, and general lab and experimental use. The main figures of merit for a balun are the amplitude (ideally 0 dB across the band) and phase balance (ideally 0 degrees, meaning perfectly 180 degrees out of phase, across the band). The BAL-0026, BAL-0036, BAL-0050, and BAL-0067 are integrated power divider-inverter baluns. This means that they have a Wilkinson power divider on the common port, an inverter before the negative port, and a matched delay line on the positive port. This provides isolation between the differential ports, making these baluns very versatile tools for laboratory use. See the blog post "Isolated Baluns Eliminate Tradeoffs in Differential Measurements" for more information. Each of these baluns maintains excellent amplitude balance, phase balance, and common mode rejection better than 25 dB across the band.

Electrical Specifications - Specifications guaranteed from -55 to +100°C, measured in a 50Ω system.
Parameter Frequency Range Min Typ Max
Insertion Loss (dB) 300 kHz to 35 GHz   6 9
  35 to 67 GHz   11.5  
Isolation (dB) 1 to 67 GHz   25  
Nominal Phase Shift (Degrees) 300 kHz to 67 GHz     180  
Amplitude Balance (dB)   ±0.7 ±2.1
Phase Balance (Degrees)   ±4 ±12
Common Mode Rejection (dB) 20 27  
VSWR (Common)   1.5  
VSWR (Output)   1.6  
Group Delay (ps)   520  
RMS Group Delay Ripple (ps)   7  
Risetime /Falltime (ps)1   2  
Total Input Power (W)     1
Weight (g)   125  
1Specified as 80%/20%. Calculated from tbalun2= (tout2 – tin2)





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