GS3001

The GS3001 incorporates Gennum's GL504 preamp, all the required coupling and decoupling capacitors, and a midsupply referencing 48 kW resistor. All that is required further for a fully functioning hearing aid system is the addition of a microphone, receiver, volume control and an MPO adjusting potentiometer.

The GS3001 can be mounted on the back of the hearing aid's battery compartment. It has several access pads allowing for adjustment of the frequency characteristics. An additional ground pad (8a) is also included to aid in the manufacturability of the system.

The GL504 chip is Gennum's proprietary low current preamplifier designed to drive class D integrated receivers. This preamp has a built-in symmetrical peak clipping output limiter and up to 46 dB of adjustable gain.

The major advantage of the GL504 over other preamplifiers is the electronic MPO adjustment. Since conventional MPO is not possible for integrated receivers, it is provided in the preamp. The maximum output swing is easily set using an RMPO resistor. The receiver output level is thus limited, preventing it from exceeding the discomfort level.