=================================================== 28-11-2023: CS stage noise performance optimization =================================================== Lecture: EE4109-5 Location: Pulse Hall 4 Time: 15:45 - 17:30 .. image:: ../../../img/colorCode.svg :alt: color coded resistors Design of CS stage noise behavior ================================= .. include:: ../../../topics/CSstage/CSstage-intrinsic-noise.rst .. include:: ../../../topics/CSstage/CSstage-eq-input-noise.rst .. include:: ../../../topics/CSstage/CSstage-eq-input-noise-SLiCAP.rst .. include:: ../../../topics/CSstage/CSstage-noise-optimization-resistive.rst .. include:: ../../../topics/CSstage/CSstage-noise-optimization-capacitive.rst Group exercise ============== The source impedance of amplifier A1 consists of the parallel connection of the hearing loop receive coil and a damping resistor of 10 k:math:`\Omega`. The hearing loop receiver has an integrating characteristic; its idealized gain has been determined as :math:`\frac{62.8\times 10^3}{s}`. #. Determine the show stopper value for the integrated noise at the output of the receive coil amplifier. #. Determine possible values of the transconductance :math:`g_m` and the input capacitance :math:`c_{iss}` of an NMOS that can be used as input stage of the receive coil amplifier. To this end, consider the MOS as the main noise contributer of the amplifier and model the noise behavior as shown below. (You can use SLiCAP for this purpose.) .. image:: noise_1.svg #. Determine the values of the channel with :math:`W`, the channel length :math:`L`, and the quiescent operating current :math:`I_{DS}` of the NMOS using the results of the previous exercise and the SLiCAP EKV NMOS model sub circuit CMOS18N and the LTspice (SLiCAP) symbol SLXM, or with the SLiCAP EKV NMOS noise model NM18_noise and LTspice (SLiCAP) symbol SLM_noise. #. After all parameters have been defined, verify the noise with SLiCAP. For this purpose use the SLiCAP sub circuit NM18_noise and LTspice (SLiCAP) symbol SLM_noise. #. Verify the result with LTspice. Downloads for this exercise: ---------------------------- `SLiCAP project archive for this exercise <../../designExample/HearingLoop/SLiCAP/SLiCAP_noise_1_1.zip>`_ `Our elaboration of the exercise `_.