Silicon Labs says quality audio design gets simpler
Silicon Laboratories has a family of AM/FM receivers which it claims can displaced complex discrete receiver designs in consumer audio/video receivers, FM receiver monitors and pro-audio receivers.??
Professional-grade audio equipment designs typically use discrete AM/FM receiver designs from manually tuned inductors and multiple active components. These can be complicated, hand-crafted receiver designs with higher cost, and extensive manufacturing overhead and test time.
There is also the challenge of maintaining audio quality, particularly for weaker signals.
According to James Stansberry, vice president and general manager of Silicon Labs’ broadcast products: “Audio equipment developers evaluating radio receiver solutions can now appreciate exceptional RF performance, single-chip integration, design simplicity and configurability.”
The firm’s Si477x devices includes two single-chip devices: the Si4770, a global multiband AM/FM receiver, and the Si4777, an AM/FM receiver supporting HD Radio tuner functionality.
The chips use patented digital low-intermediate-frequency (low-IF) architecture to deliver high audio quality under the most demanding environments.??With -3.5dBµV sensitivity, the Si477x receivers can tune to signals down to 0.67µV, picking up stations up to 100 miles away, said the supplier.
Featuring a highly linear RF front end and sophisticated RF and IF automatic gain control coupled with a state-of-the-art dynamic bandwidth control algorithm, the Si477x receivers optimise sensitivity and selectivity in strong signal environments to ensure good reception. ??
The receivers also feature an on-chip FM channel equaliser designed to eliminate multipath fading and for good reception under complex multipath interference conditions present in urban settings. The equaliser’s patented adaptation algorithm corrects for multipath fading, which occurs when a radio station’s signal reaches the receiver along with time-shifted versions of the station’s same signal reflected off of buildings and other large objects.
“The equaliser significantly reduces audio distortion with fewer sound-compromising mitigation fixes applied to the audio and is a first of its kind in the audio industry,” said the supplier.??