Models 1959, D1959 Millimeter Wave PIN Diode Attenuator/Modulator MODEL 1959 The Model 1959 is a current-controlled attenuator/ modulator that provides a minimum of 50 dB of attenuation over the frequency range of 18 to 40 GHz. As shown in figure 1 below, the rf circuit uses two shunt arrays of PIN diodes and two quadrature hybrid couplers. The quadrature hybrids are of a unique GMC microstrip design which are integrated with the diode arrays to yield a minimal package size. MODEL D1959 The Model D1959 voltage-controlled linearized attenuator/modulator is an integrated assembly of a Mode! 1959 and a hybridized driver circuit which provides a nominal transfer function of 10 dB per volt. (See figure 2 below.) RF IN/OUT 502 RF IN/OUT Fig. 1Model 1959, rf schematic diagram +V Vv 70 -50C | +25C + 100C 60 = CONTROL - INPUT DRIVER g (o3_ CIRCUIT (VA CONVERTER) Z 40 , 3 bias 2 ~ 20 RF iNOUT SERIES 195 AF IN/OUT 10 PIN DIODE po 3 n ATTENUATOR sz 0 02 04 06 08 10 12 14 16 18 20 22 RELATIVE BIAS CURRENT Fig. 3Model 1959, typical effects of temperature on attenuation. Fig. 2--Mode! D1959, block diagram 156Models 1959, D1959 Specifications PERFORMANCE CHARACTERISTICS COMMON TO BOTH MODELS 1859 and D1959 Mean Attenuation Range.............. 50 dB Monotonicity.......... Guaranteed Power Handling Capability Without Performance Degradation...... 10 mW cw or peak Survival Power..... 0.2W average, 5W peak (1 usec max pulse width) MODEL. 1959 Rise and Fall Times Rise Time........... 75 nsec max Fall Time........... 20 nsec max " Bias Current for Maximum Attenuation......... 15 to 70 mA Temperature Effects. . See figure 3 ENVIRONMENTAL RATINGS AND AVAILABLE OPTIONS See page 166. MODEL D1959 Accuracy of Attenuation Oto30dB............. +0.5 dB 30 to50 dB........... +1.0 dB Temperature Coefficient............ + 0.025 dB/C Switching Characteristics On Time.............. 300 nsec Off Time.............. 30 nsec max'!) Nominal Controt Voltage Characteristics Operating............. 0 to +5V Transfer Function........ 10 dB/voit Input Impedance......_.. 10 Kohms Modulation Bandwidth Small Signal........... 5 MHz Large Signal........... 2 MHz Power Supply Requirements.......... +12V +5%, 100 mA -12V +5%, 20 mA Power Supply Rejection.............. Less than 0.1 dB/Volt change in either supply (1) For attenuation steps of 10 dB or more .38 1 (3,7) i? , 6ND~_* J MOUNTING SURFACE 2x@ 104(2,6) 55 \ RF CONN a - 14,0) TYPE K FEMALE 38(9,7} FOR K FEMALE (TYP) ex 50 (12,7) FOR K MALE. (TYP) ft MODEL 1959 Wt: .8 oz. (23 gm) approx. DIMENSIONS AND WEIGHTS 25 r Bish g we 29. | w= 070 m we 99 4t4,9) | | (272) 79 | (2,3) | hy ze t Ory 4.25 : (318) GN 1,070 | et p (27.3) or! i A | 4 MOUNTING @ 2x8 1041267" A 09 SURFACE 4 2). ee *~ = (14,07 RE CONN 438 19,7) FOR K FEMALE (TYP) gyre K FEMALE .50 (12,7) FOR K MALE (TYP) x MODEL D1959 Wt: 1 oz. (28 gm) approx. 157 Dimensional Tolerances, uniess otherwise indicated: .xx +.02; .xxx +.005