CMOS Circuit Design for RF Sensors by Gunnar Gudnason, Erik Bruun

By Gunnar Gudnason, Erik Bruun

This helpful reference is ready CMOS circuit layout for sensor and actuators for use in instant RF platforms. It locations distinct specialize in the facility and information hyperlink in a instant process with transducers powered through the RF hyperlink, providing novel ideas and strategies.

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This behavior is derived by assuming that the p-channel and n-channel transistors in the input quad are matched. This matching can obviously never be performed because of the independent process variations of the two transistor types. While this mismatch would be unacceptable in a precision circuit it does not have a severe effect on the envelope detection in the demodulator. One of the features which makes this circuit attractive for our purposes is that a relatively high small-signal bandwidth can be achieved with low power levels.

To aid in the task of symbol synchronization, the modulation was synchronized with the carrier, with each data bit using exactly 50 carrier periods. The data link was used to transmit 32-bit command words to the device and each command was preceded by two start bits to aid in the detection of each command. 3. The figure does not show the digital state machine which was used to perform the symbol synchronization or the PLL whose task it was to track the carrier and generate the system clock. The signal is taken directly from one terminal of the receiver coil to the gate of the source follower M1.

The stable frequency may be necessary for stimulation pulse timing [43] or to set the sampling intervals in a sensor system. Unless a crystal oscillator is added to the system, the carrier frequency is the most stable timing signal available. One task of the receiver is therefore also to extract the carrier signal and generate the system clock from it. This may be as simple as to convert the analog carrier to the digital domain with a hard limiter. Some modulation types, like on-off keying PAM or FSK, do not provide a carrier signal which is present at all times with a fixed frequency.

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