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  1. Alex_Bam

    Design review: Fully differential telescopic Operational amplifier.

    Hello, I used Behzad Razavi's book to design a fully differential telescopic op-amp [screenshot attached]. Then I follow the same steps to design my proposed opamp, but I am not getting the desired result. Can someone point out where I'm doing mistakes? For your reference, I have attached hand...
  2. Alex_Bam

    2nd order Butterworth High Pass filter

    Hello, Could anyone review my 2nd order Butterworth HPF design? I have mentioned design details along with schematics and initial results. Design specifications for 2nd HPF: Cutoff frequency= 100Mhz, Design method: by considering equal component, Input signal= 10V,120MHz, sinusoidal. Design...
  3. Alex_Bam

    Hysteresis width of ST , power, frequency.

    Hello. I would like a better understanding regarding Schmitt-trigger. What I know is: the wider the hysteresis width is, the more it provides noise immunity. But I am curious about the relationship between incoming signal frequency and the hysteresis width? And also the relationship of power...
  4. Alex_Bam

    Inverting a modulated signal (OOK).

    Hello, I'm modulating the message signal with OOK (on-off keying) modulation. Multisim software is used to model the schematic [attached]. At the resistor R1, the modulated signal is obtained. I wanted to invert the modulated single, for that I used a simple NOT gate (U3), however at the NOT's...
  5. Alex_Bam

    Differerntial demodulation using single-stage opamp and LPF.

    Hello, I am designing a differential isolator via a capacitive coupling technique in which a control signal is differentially modulated and coupled capacitively to the differential demodulator side. I have designed a demodulator using single-stage Opamp and LPF [Schematics attached]. The problem...
  6. Alex_Bam

    Demodulating differential signal.

    Hello, I am demodulating differential signal using LPF based demodulator. The schematic of the entire system is attached which includes diff modulator, coupling capacitors, and demodulator. A modulated signal of 17 Mhz is demodulated. For the demodulator, I designed a 2-stage differential...
  7. Alex_Bam

    PVT independent ST based multi-vibrator design.

    I am doing PVT analysis of an RC-based multi-vibrator. Simulations under varying temperature (0-100 C) and process corners (FF, FS, SF, SS) show signal delay in the modulated signals. This delay is due to the effect of temp and process on R1, C1, and MOSFET's threshold voltage. -I used PVT...
  8. Alex_Bam

    FM demodulation of differential signal.

    Hello everyone, I am designing LPF based differential demodulator(LPF_DDM) to retrieve differentially modulated signals, which are on-chip capacitive isolated [shown]. LPF_DDM includes a differential amplifier, LPF, and Schmitt trigger. I designed a two-stage opamp [specification below], as a...
  9. Alex_Bam

    Schmitt trigger based NAND gate

    Hello everyone, If someone can help me to understand how to calculate the hysteresis of the Schmitt trigger-based NAND gate? Which MOSFET's dimension decides the Vth_H and Vth_L? Thanks.
  10. Alex_Bam

    Process Corner Variation in analog circuit design.

    Hello, I have designed an LPF demodulator. In a normal situation it's working fine, however when i carried out the Process corner simulation, the threshold voltage of MOSFET changes which is obvious, due to which MOSFET's operation region changes, ultimately change the output. My question is ...
  11. Alex_Bam

    Design problem in CMOS differential Amp

    Hello, It's my first attempt to design CMOS Differential amplifier in 0.35um technology using a cadence tool. I search threads related to my problem in this forum but could not able to solve my problem. So I will explain my approach in deriving dimensions of MOSFET's used in it. Moreover, I have...
  12. Alex_Bam

    Understanding two Multivibrator models

    Hello , I simulated the two multivibrator models in CMOS technology using the cadence tool. I was expecting the model 2 with Schmitt trigger(ST) will show robustness in PVT (Process Voltage temperature) analysis as compared to model 1 due to ST. But this was not the case both the Models shows...
  13. Alex_Bam

    Problem in Process corner simulation using Cadence ADXL tool.

    Hello, My question is related to CADENCE software simulation. I am doing a process corner simulation of a simple inverter using ADXL in CADENCE. But the problems are: 1_ When I run only the nominal corner it simulates successfully as shown in the figure. 2-But when I add worse power /worse...
  14. Alex_Bam

    Designing differential Signal modulator.

    I would like your suggestion on my first design Differential signal modulator [simulation attached]. Before jumping into design let me highlight my objective. I am differentiating a control signal of 1MHz and then modulating it with carrier frequency 15MHz(not limited to this specific value but...
  15. Alex_Bam

    Opto-isolator/ optocoupler for electric isolation in IC design.

    Hello everyone. I came across while reading the opto-isolator technique used for electric isolation in embedded systems/ Integrated Circuits design that " Opto-isolator is not recommended for electric isolation in power applications IC's mainly due to its dV/dt sensitivity". So I would like to...
  16. Alex_Bam

    Designing Schmitt trigger oscillator using CMOS NAND gate.

    Hello, I am designing a Schmitt trigger oscillator based on a CMOS NAND gate. The block diagram along with schematics and its results are attached for your reference. I am using the CADENCE tool with 0.35um technology. Question: it can be seen in the result, the charging time of the capacitor...
  17. Alex_Bam

    PMOS Current Mirror

    Hello I am designing a PMOS current mirror in 350nm Cadence technology [/I] I would like to know How and Why my mirror current is changing with changing supply voltage (Vdd)? Thanks Moderatores note : inverted colors for better readability and posted inline
  18. Alex_Bam

    Low Pass filter and Schmitt trigger

    Hello I am recovering the PWM message signal at the demodulator side of the system. In the attached schematics you can see Low pass filter which filters high frequency, then the signal is fed to Schmitt trigger to retrieve the message signal. I aimed to design the whole system on IC 350nm...
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