Amplifier with voltage-controlled gain is high speed
20 October 2004Analogue, Mixed Signal, LSI
Products & Solutions
The VCA810 is a DC-coupled, wideband, continuously variable, voltage-controlled gain amplifier from Texas Instruments. It provides a differential input to single-ended output conversion with a high-impedance gain control input used to vary the gain over a -40 dB to +40 dB range linear in dB/V.
Operating from ±5 V supplies, the gain control voltage for the VCA810 will adjust the gain from -40 dB at 0 V input to +40 dB at -2 V input, says the manufacturer, while increasing the control voltage above ground will attenuate the signal path to >80 dB. Signal bandwidth and slew rate remain constant over the entire gain adjust range. This 40 dB/V gain control is linear to within ±0,5 dB, allowing the gain control voltage in an AGC application to be used as a received signal strength indicator (RSSI) with ±0,5 dB accuracy.
According to the manufacturer, excellent common-mode rejection and common-mode input range at the two high-impedance inputs allows this device to provide a differential receiver operation with gain adjust. The output signal is referenced to ground. Zero differential input voltage gives a 0 V output with a small DC offset error. Low input noise voltage ensures good output SNR at high gain settings. In applications where pulse edge information is critical, and the VCA810 is being used to equalise varying channel loss, minimal change in group delay over gain setting will retain good pulse edge information.
An improved output stage provides adequate output current to drive the most demanding loads, says TI. While principally intended to drive ADCs or second-stage amplifiers, the ±60 mA output current will easily drive doubly-terminated 50 Ω lines or a passive post filter stage over the ±1,7 V output voltage range.
For more information contact Les Bidgood, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected]
Adaptive optics’ power solution Altron Arrow
Opto-Electronics
Vicor power-dense adaptive optical modules enable colossal telescopes to look into the past for deep space discoveries.
Read more...Wide input voltage buck-boost converter Altron Arrow
Power Electronics / Power Management
The MAX77859 from Analog Devices is a high-efficiency, high-performance buck-boost converter targeted for systems requiring a wide input voltage range of between 2,5 and 22 V.
Read more...IMU with dual-sensing capability EBV Electrolink
Analogue, Mixed Signal, LSI
ST’s 6-axis inertial measurement unit integrates a dual accelerometer up to 320g and embedded AI for activity tracking and high-impact sensing.
Read more...High-performance processor for edge-AI Altron Arrow
DSP, Micros & Memory
The STM32MP23 microprocessor from STMicroelectronics is the latest addition to the STM32MP2 series, designed to meet the demands of industrial, IoT, and edge AI applications.
Read more...Plural data converter series
Analogue, Mixed Signal, LSI
Silanna Semiconductor has announced the launch of Plural, a new generation of data converters for customers eager to find a more available, affordable, high-performance alternative to existing brands.
Read more...6 GHz power amplifier Altron Arrow
Telecoms, Datacoms, Wireless, IoT
Analog Devices’ ADPA1116 is a 0,3 to 6 GHz GaN-based power amplifier with a saturated output power (POUT) of 39,5 dBm.
Read more...Advanced surveillance storage from ASBIS
Infrastructure Surveillance Products & Solutions
From a video storage solutions perspective, SkyHawk drives, designed for DVRs and NVRs, offer high capacity, optimised firmware, and a reliability workload rating of hundreds of terabytes per year.
Read more...STM releases innovative GNSS receiver Altron Arrow
Telecoms, Datacoms, Wireless, IoT
STMicroelectronics recently introduced the Teseo VI family of global navigation satellite system receivers aimed at high-volume precise positioning use cases.
printer friendly version