Abstract: The present invention relates to a device and method for injecting a noise signal into a wire pair of a communication link. In operation a differential mode noise signal is received at a first and a second input port, which are connected via a first and a second resistor to a first and a second end tap of a primary coil of a transformer, respectively. The transformed differential mode noise signal is then transmitted via a first and a second end tap of a secondary coil of the transformer and a third and a fourth resistor to a first and a second output port for injection at high impedance into a first and a second wire of the communication link. Optionally, the device comprises a third input port connected to a center tap of the secondary coil for receiving a common mode noise signal. The common mode noise signal is then provided at low impedance to the first and the second wire via the first and the second end tap of the secondary coil and via the third and fourth resistor having low impedance, respectively.

Abstract: A testing circuit for use in an inductive coupling system to test communication devices is disclosed. The testing circuit including at least an output transformer having a frequency response for providing a signal having electrical properties compatible with a communication device to be tested; and, a spectral shaping circuit having an input port for receiving a test signal and an output port for providing a shaped test signal, the shaped test signal for being provided via the at least an output transformer to a device under test, the spectral shaping circuit for partitioning the test signal in dependence upon pre-determined spectral ranges thereof and relating to a frequency response of at least an output transformer for shaping the frequency characteristics of the received signal in approximately inverse proportion to the frequency response of the at least an output transformer.

Abstract: A testing circuit for use in an inductive coupling system to test communication devices is disclosed. The testing circuit comprises at least an output transformer having a frequency response for providing a signal having electrical properties compatible with a communication device to be tested; and, a spectral shaping circuit having an input port for receiving a test signal and an output port for providing a shaped test signal, the shaped test signal for being provided via the at least an output transformer to a device under test, the spectral shaping circuit for partitioning the test signal in dependence upon pre-determined spectral ranges thereof and relating to a frequency response of at least an output transformer for shaping the frequency characteristics of the received signal in approximately inverse proportion to the frequency response of the at least an output transformer.

Abstract: The present invention relates to a device and method for injecting a noise signal into a wire pair of a communication link. In operation a differential mode noise signal is received at a first and a second input port, which are connected via a first and a second resistor to a first and a second end tap of a primary coil of a transformer, respectively. The transformed differential mode noise signal is then transmitted via a first and a second end tap of a secondary coil of the transformer and a third and a fourth resistor to a first and a second output port for injection at high impedance into a first and a second wire of the communication link. Optionally, the device comprises a third input port connected to a center tap of the secondary coil for receiving a common mode noise signal. The common mode noise signal is then provided at low impedance to the first and the second wire via the first and the second end tap of the secondary coil and via the third and fourth resistor having low impedance, respectively.