Prajay Madhavan Email & Phone Number

Bengaluru, Karnataka, India

Bengaluru Area, India

The company focuses on designing differentiated products for Industrial and home usage. We analyze the market and conceptualize products, derive the specifications and drive it past the production.ZS-2102-A : IOT Power profilerWe designed a state of the art power profiler device named ZS2102A, to measure the power consumption and battery life of IOT devices. This tool can measure the sleep current and transmit current of IOT devices, without range switching. In short, it can measure uA to 1A with 2uS response time. The tool can measure and log the data for multiple hours at a time. With real world battery models, the battery life of any IOT device can be estimated very accurately.This product is used by hundreds of engineers around the world to design better IOT products.ZS1100A : IOT Power SupplyWe followed it up with a precision power supply with current profiling feature for IOT products. This combines the features of the ZS2102A with a programmable power supply. The product is code named ZS1100A and is selling around the world.https://www.youtube.com/watch?v=vcWPTVeKSFAhttps://www.crowdsupply.com/zscircuits/zs1100a-power-meter

Bengaluru Area, India

In this role my key responsibilities include the board design for the test and char of a RF transceiver with high speed ADC/DAC with 3Gsps sampling rate. It also includes designing the front end matching network and selecting balun circuits for the cellular bands.

Bengaluru Area, India

Board designs--------------Architected and designed the CC3200 Launchpad CC3200-LAUNCHXL and the CC3100 Boosterpack boards CC3100BOOST which became one of the best selling evaluation kits from TI and is widely appreciated across the industry for its low cost, list of features and performance. My key activities include solving system level issues like WiFi spectral mask failure due to noise coupling, board level signal integrity affecting data loss, RF power loss due to impedance mismatch, Chip and PCB antenna design using Momentum etc. I also headed the interaction with vendors to manufacture these boards to optimize the total cost of the entire evaluation kit. In follow up to this I also designed the CC3220 and CC3120 evaluation kit boards which were designed in Altium.Module design---------------I designed the CC3200MOD module from scratch. The module was designed with special ground isolation to minimize the noise, which helped pass FCC cert in the first run, thus saving lot of money.Other Misc activities=============I was also leading the evaluation and selection of components for the WiFi Radio, including band-pass filter, Crystals , Power inductors, chip antenna etc. Communicating with customers around the world to solve their RF and hardware issues by forums or emails/conference calls. Authored a number of application note including Hardware design guide, PCB layout guidelines, Hardware Debugging Guide, Schematic checklist, ADC application note, Board user guide and others.

Bengaluru Area, India

In this role my key responsibilities were to solve customer problems related to the TI GPS receiver. My focus was primarily on the RF and Hardware issues causing GPS receiver to malfunction. I travelled extensively to various countries including China, Japan, Korea, Taiwan, Sweden, Denmark, Israel, USA, UK, Canada to solve customer issues on their mobile phone designs.Some of the issues solved included spurious emissions causing SNR degradation, Thermal shock of the TCXO causing loose of lock in GPS signal, Compression of GPS signal due to clock harmonic, jamming signal etc.My other key roles included the design of reference boards for customers, interacting with various mobile phone manufacturers to understand system issues and debug them. I was also active in RF test and characterization, evaluation of components for GPS systems like TCXO, SAW filter, LNA antenna etc.GPS Field test board=============I designed a reference design for GPS receiver for collecting field data. This was a complete system built from scratch which enables collection of field data by people with no hardware skill-sets. The complete system was battery powered and it would display the GPS position in real time along with the satellite signal strength. This system enabled collection of field data from 1000s of KM of performance test which enabled TI to improve the position engine algorithms. I also wrote the firmware for this system which involved using an RTOS to schedule various tasks like display on LCD, writing data to the SD card, taking user inputs, processing the GPS information etc. I also designed the mechanical enclosure for the board which made it robust to be used for field tests.RF test and characterizationDuring the GPS days, I was also performing the test and characterization of GPS devices. These tests included measurement of RF parameters like Noise Figure, IP2, IP3 measurement, Compression testing, blocking test with cellular jammer, coexistence analysis etc.

Bengaluru Area, India

GPS performance measurement boardI designed all the TI reference designs for GPS including the NL5300, NL5350 series of GPS devices. These reference designs were complicated as the GPS receiver had a noise floor of -171dBm/Hz and the noise coupling had to be kept to a minimum to achieve this performanceAntenna design.I had also designed a PIFA antenna using PCB traces for the GPS receiver. This antenna was simulated in momentum and fabricated on FR4 PCB and achieved an omni-directional pattern with a gain of -2dBi with other components present on the board. I also designed matching network to match the antenna over the GPS range of frequencies with a return loss better than 15dB.TCXO evaluationThe TCXO stability is a very important part of any GPS receiver function as the GPS receiver has very tight specifications on the offset, temperature drift and thermal shock performance. During the GPS testing by cellular phone manufacturers it was found that TCXOs would exhibit a frequency drift when there is a thermal shock presented to it. I played a key role in understanding this thermal shock impact on the TCXO and driving this with the TCXO manufactures to make them more robust by improving their mechanical design. This had helped TI GPS receivers to perform better under real world conditions.Hybrid positioning platformI also designed a hybrid positioning platform for TI which enabled the development of an inertial navigation system for GPS augmentation. This platform had multiple sensors like accelerometer, Gyroscope, E-compass, altimeter etch which communicated over I2C with the GPS processor. The GPS processor would use this data in absence of GPS signal to propagate the previous known position. This helps the receiver compute the position in case the vehicle enters a tunnel or a blockage condition.

Bengaluru Area, India

During this time I was assigned the task of testing of an RF transceiver for WLAN. This was an RF front end with RF in and IF output. I was involved with the testing of various RF parameters like Noise Figure, 1dB compression point, IP2, IP3, out of band blocking performance. I was working on both the bench and ATE characterization in Dallas. My other activity included designing the board for the testing of high speed ADC and DACs (12bit/80Msps) used for the WLAN radio. I also characterised the high speed ADC and developed automation for the same using Labview. The main parameters for measurement were SNR, THD, SINAD, SFDR etc..