Microwave Engineering Europe - October 2008 - (Page 22)

22 FILTERS & FREQUENCY SYNTHESIS Latest advances in ﬁlter and frequency synthesis technology push higher frequencies and lower noise in broadband applications By Jean-Pierre Joosting Lowpass active ﬁlters/ampliﬁers suit a wide range of wireless communications Linear Technology’s latest family of four high performance dual ﬁxed frequency lowpass active ﬁlters/ampliﬁers target a wide range of wireless communications and industrial signal processing equipment applications. The LT6604-xx consists of two matched, fully differential ampliﬁers, combined with 4th order ﬁlters approximating a Chebyshev lowpass response. Each device offers guaranteed matched amplitude and phase characteristics, enhancing the performance of current and next generation wireless communication standards such as LTE and WiMAX, while addressing the challenge of channel matching. These products offer best-in-class low distortion and low noise, supporting a high system signal-to-noise performance. The differential output stage of each ﬁlter is designed to drive directly into high-sampling rate A/D converters with minimum distortion and high signalto-noise performance. Each ampliﬁer has a minimum output swing of 2 Vp-p and an adjustable common-mode voltage, allowing it to interface to a wide range of A/D converters. The small 4- x 7-mm package offers signiﬁcant space savings compared to prior discrete solutions. The ﬁlter combines baseband channel ﬁltering and gain matching to form a compact solution for high-performance I/Q demodulators. Additionally, these devices can be used as pre-ﬁlters for multichannel A/D converters. Each ﬁlter in the LT6604 offers better than 0.9 dB of in-band gain ﬂatness right up to the cutoff frequency. The 4th order Chebyshev ﬁlter provides sharp roll-off while exhibiting minimum group delay response. The ﬁlter characteristics are speciﬁed for 3 V, 5 V and ±5 V supply operation. Each differential ﬁlter/ampliﬁer gain can be set from 0 dB to more than 12 dB using a pair of external resistors. The LT6604 draws a total quiescent supply current of 26 mA per channel. SMBV100A vector signal generator from Rohde & Schwarz delivers a costeffective solution for WiMAX, 3GPP FDD, HSPA and LTE applications. All four devices are offered in a 34-lead, 4- x 7-mm QFN surface mount package with identical pinouts. www.mwee.com/210700050 General purpose vector signal generator targets WiMAX, 3GPP FDD, HSPA and LTE The SMBV100A vector signal generator from Rohde & Schwarz offers performance that until now has been available only in considerably more expensive instruments. It provides a typical output level of +24 dBm up to 6 GHz and a maximum RF bandwidth of 528 MHz. Digital standards such as WiMAX, 3GPP FDD, HSPA and LTE can be conﬁgured directly on the instrument using its intuitive user interface. An integrated modulation generator generates the baseband signals internally, eliminating the need for a PC. Since users can perform on-site service themselves, downtime and cost of ownership are reduced to a minimum. Ideal for users who develop digital RF modules, produce RF receivers, or investigate highly complex radar applications, the instrument has been developed to provide maximum options ﬂexibility. For measurement tasks in research and development, the generator, which features a frequency range from 9 kHz to 6 GHz and an RF bandwidth of up to 120 MHz with internal baseband, has been designed to handle next-generation wireless communications technologies. Using an external I/Q source, the RF bandwidth can be extended to 528 MHz. All important digital radio standards are available at the press of a button. Due to its short frequency and level setting times (<1 ms in List mode), the SMBV100A enables high production throughput. The large ARB memory ensures that different test scenarios are simultaneously available. This makes it possible to directly switch between signals without time-consuming reloading. The resulting fast switchover times also contribute to speeding up production. When a power sensor of the NRP family is connected, the SMBV100A can determine the test setup’s cable losses and frequency response. Owing to the high output level of +24 dBm typical, losses are easily compensated without the external ampliﬁers that are normally needed in such tests. The long calibration interval of three years and the advantage of being able to perform Microwave Engineering Europe ● October 2008 ● www.mwee.com 022_024_MWEE.indd 22 6/10/08 12:36:45 http://www.mwee.com/210700050 http://www.mwee.com

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Microwave Engineering Europe - October 2008 Contents Comment News Cover Feature: AWR's AXIEM Software Brings 3D Planar Electromagnetic (EM) Simulation "Up Front" RFID: Augmented Reality: Beyond RFID and QR Codes for Mobile Phone Platforms Filters & Frequency Synthesis ZigBee Goes Green with Support for Smart Energy Simplify Mobile Data Applications and Services Test Enabling the State-of-the-Art in Automatic Test Equipment National Physical Laboratory Test Facility Aids Development of Next-Generation Antennas Selecting the Synthetic Test Environment for Transmit-Receive (T-R) Modules in a Phased Array Radar System Products Calendar

Microwave Engineering Europe - October 2008

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