Answer Happy

Congratulations. You have been hired by Biomechanisms, a company designing a prosthetic leg. The goal is a low cost, energy efficient device. You have been assigned to the electronics team designing the interfaces between the foot location systems, the leg processing and the patient's nervous system. The system uses two sensors to guide foot placement: a camera is aimed down and slightly forward and a touch sensitive surface on the foot. A high-level block diagram is shown below. Bio-interface Central Controller Touch Sensor Camera Emergency Switch 1. A team mate comes to you with the design shown below.

10V 2M22 4k92 1M2 3k92 The data sheet for the MOSFET gives the following values: Vy = 1V and ke=0.5mAV a. The team mate wants to know what the Q-point is? b. The team mate wants to know if the transistor is in saturation and, if it is not, what changes should be made? 2. a. The engineer responsible for the communications links says the link budget for the touch sensitive surface is -3dB at the sensor, -6dB over the link and -3dB at the receiver. How many bits will this system require to achieve OdB? b. The touch sensitive surface outputs a 120kHz signal. The engineers want to sample at 4 times the Nyquist frequency. The bandwidth of the channel is 5 MHz. What is the maximum bit depth each sample can offer?