Integrated Magnetic Loop Probe in GaAs Technology for Active Near-Field Sensor

Integrated active miniature sensors for electro-magnetic near field measurement

“…The analytically [7] approximated inductance of about 250 pH and resistance of about 0.82 n are again well confirmed by EM simulation and measured S parameters [14]. For simulation under electromagnetic field excitation the conditions are kept same as in the case of the loop in GaAs technology.…”

“…Fig. I shows a 100 11m square loop with 5 11m trace width [4] and a dipole with 100 11m arm length [5]. Using the back-side metal and via-hole option, also a vertical loop as shown in fig.…”

“…Using the back-side metal and via-hole option, also a vertical loop as shown in fig. 1 b became possible [4]. The metal widths are 20 11m on top, and 50 11m on back side.…”

“…10. It comprises two common emitter type differential stages connected via emitter followers for dc level shifting and buffering [14]. For better stability of the amplifier, current feedback resistors are used at the emitters of the tail current sources.…”

“…The simulated input referred noise voltage is 1.35 nV/�Hz at 2 GHz. The dc power consumption is 150 mW from +3.0 V and -2.0 V supplies and the chip size is 0.75 x 0.75 mm2 [14] . The amplifier integrated with a planar loop and an additional on-chip excitation loop is depicted in fig.…”