Duplexer Filters GSM Systems
Model AM902-947SD363 is a surface-acoustic-wave (SAW) duplexer for GSM applications. It provides a transmit frequency band from 890 to 915 MHz with
1.7-dB typical passband insertion loss and receive frequency band of 935 to 960 MHz with 2.3-dB typical passband insertion loss. The duplexer achieves at least 48 dB isolation between the receive and transmit bands, with low reflection evidenced by 1.70:1 typical VSWR at the antenna port and 1.60:1 typical VSWR at the receiver port. The component is designed for 1.2 W maximum input power and operating temperatures from −30 to +85°C. It measures 3.80 × 3.80 × 1.45 mm.
Anatech Electronics, Inc., 70 Outwater Ln., Garfield, NJ 07026; (973) 772-4242, www.anatechelectronics.com
Phase Shifters Steer 360 deg. from 0.5 to 18 GHz
A series of 8-b programmable phase shifters covers frequency bands from 500 MHz to 18 GHz with 360-deg. control. Three new models adjust phase in 1.4-deg. increments in as many as 256 tuning steps and with phase shift error minimized from ±0.9 to ±4.5 deg. The phase shifters handle CW input levels from +13 to +30 dBm and have fast switching speeds of 30 to 265 ns. They incorporate TTL control and are supplied with field-replaceable SMA or 2.92-mm coaxial connectors. The digitally controlled analog phase snifters are suitable for radar, communications, and EW applications working with phased-array antennas that require exact phase control.
Fairview Microwave, Inc., 17792 Fitch, Irvine, CA 92614, (949) 261-1920; www.fairviewmicrowave.com
Low-Noise VCO Tunes 10.5 to 11.0 GHz
Optimized for X-band applications from 10.5 to 11.0 GHz, model DXO10701095-5 is a low-noise voltage-controlled oscillator (VCO) with low harmonics and phase noise. It exhibits typical phase noise of −82 dBc/Hz offset 10 kHz from the carrier with harmonic content of typically −22 dBc. The oscillator delivers minimum output power of +2 dBm and offers 40 to 68 MHz/V tuning sensitivity for a tuning range of 0.5 to 15.0 V. The frequency pushing is typically 10 MHz/V while the frequency pulling is typically 20 MHz for a 1.75:1 VSWR. The VSO typically draws 25 mA current from a +5-V dc supply. It is designed for operating temperatures from −40 to +85ºC.
Synergy Microwave Corp., 201 McLean Blvd., Paterson, NJ 07504; (973) 881-8800, www.synergymwave.com
SP12T PIN Diode Switch Controls 2 to 18 GHz
Model SW12A003 is a single-pole, 12-throw (SP12T) absorptive PIN diode switch with high isolation and fast switching speed from 2 to 18 GHz. An integral TTL driver offers ease of control. The rugged 50-Ω switch, which is suitable for communications, radar, and EW applications, is powered by +5 V dc and −12 to −20 V dc supplies. It is supplied with field-replaceable female SMA connectors. Three 0.096-in. through holes are provided for convenient chassis mounting.
Amplical Corp., 20 Troy Rd., Whippany, NJ 07981; (973) 386-1119; www.amplical.com
Dual-Directional Coupler Channels 300 W to 520 MHz
For coupling high-power signals in tight spaces, the model DDCH-50-521+ dual-directional coupler handles 300-W maximum mainline power from 20 to 520 MHz and provides 50-dB coupled signals with 13-dB typical return loss. It also passes as much as 4 A current from mainline input to output and boasts typical mainline input and output return loss of 35 dB to 150 MHz and 30 dB to 520 MHz. The tiny 50-Ω coupler is supplied on an open printed-circuit laminate measuring 1.0 × 1.5 × 0.128 in. with wrap-around terminations for ease of mounting on high-frequency PCBs. It features low typical insertion loss of 0.10 dB across the full frequency range, with typical fullband directivity of 21 dB, and typical fullband coupling flatness of ±0.65 dB. Suitable for commercial and military applications, the dual-directional coupler is designed for operating frequencies from −55 to +105ºC.
Mini-Circuits, P.O. Box 350166, Brooklyn, NY 11235-003; (718) 934-4500, www.minicircuits.com
Differential Amplifier Offers Unity Gain to 1 GHz
Model LTC6419 is a dual broadband differential amplifier with low input noise and gain-bandwidth product of 10 GHz. It features unity-gain response past 1 GHz, with gain of 100 for a 100-MHz bandwidth. The spurious-free dynamic range is 85 dB at 100 MHz while driving 2-V peak-to-peak signals. The input voltage noise density is 1.1 nV/(Hz)0.5. The channel-to-channel isolation is 95 dB at 100 MHz. The differential gain of each amplifier can be set with four external resistors. The maximum gain is 400 for a bandwidth of 30 MHz. The dual differential amplifier, which allows DC coupling, is available with different grades and operating temperature ranges for different applications, including driving high-sample-rate analog-to-digital converters (ADCs). It is supplied in a 4 × 3 × 0.75 mm, 20-lead LQFN plastic package.
Linear Technology Corp. (now Analog Devices), McCarthy Blvd., Milpitas, CA 95035; (408) 432-1900, www.linear.com
A family of scalable pulsed L-band amplifiers features an expandable, modular architecture that allows users to add 3U blocks to add power as needed. The amplifiers operate from 1 to 2 GHz with a starting pulsed output-power level of 2 kW, which can be expanded to 4 kW and 8 kW with the additional modules. The rack-mount pulsed amplifiers include automatic-gain-control (AGC) and automatic-level-control (ALC) blocks to simplify system integration. They are equipped with a host of protection functions, including output power limit, fault shutdown, and VSWR protection for shutdown on faults. The amplifiers can be supplied with RS-232 or RS422 interface.
Empower RF Systems, Inc., 316 W. Florence Ave., Inglewood, CA 90301; (310) 412-8100, www.EmpowerRF.com