week #4: discussion results
DESCRIPTION
Week #4: Discussion results. OTAs and case study. Group #33 Group member: Tianhao Han Ximeng Sun(Susie) Xing Cao(Star) Zhuoran Yang. Why there is no high input voltage OTAs?. Strengths of an OTA. Have a high work frequency. Have a not complicated circuit to build. . - PowerPoint PPT PresentationTRANSCRIPT
Week #4: Discussion resultsOTAs and case study
Group #33Group member:
Tianhao HanXimeng Sun(Susie)
Xing Cao(Star)Zhuoran Yang
Why there is no high input voltage OTAs?
Strengths of an OTA
Have a high work frequency.Have a not complicated circuit to
build.
What are the applications of OTAs?
Use OTA to build a Filter
Use OTA to build a Filter
Where gain can be changed by the inner current.
Strengths of a filter composing with OTAs
Have a low power consumption. Have a good thermal stability. Have a small chip area. Easy to integrate.
What does filters use for?
Filters---------Electronic FiltersElectronic filters are used to prevent certain electronic frequencies from passing from one region of an electronic circuit to another region of that circuit. Electronic filters generally perform one of three functions: allowing certain electrical frequencies to pass through the filter, blocking certain frequencies from passing through the filter and completely blocking direct current electrical energy.
Applications of electronic filters
Band-pass Filters
Band-stop Filters
DC Blocker Filters
Read more: Uses of Electronic Filters | eHow.com http://www.ehow.com/list_7169347_uses-electronic-filters.html#ixzz27XK7yeXr
Filters in real world1, Car devices2, Electronic data processing and office equipment3, Drive and control equipment4, Automatic control equipment5, Elevator and lifting equipment6, Military equipment7, Telecommunication device8, Power generation and power supply9, Machinery manufacturing equipment10, Building automation11, Household appliances
Why there is no high input voltage OTAs?
Why there is no high input voltage OTAs?
Have a larger area. Cost more. Have a bad thermal stability.
Why there is no high input voltage OTAs?Main reason might be: Have more power consumption.
We “imagine” we are Marketing EngineerAnd we do our own case!
Smaller, smarter, colorful…………….but…..
Quiz Time!Do you have a smart phone?
Y/NDo you charge your phone every
single day? Y/N
Do you have the issue that when you need to use cell phone but it is out of battery?
Y/NDo you want to charge your
phone when you are outside?Y/N
Why don’t we use a solar to charge our cell phones!
Good News!!!----Some good news about using solar energy and produce
Solar cell efficiencyEff = (Im*Vm)/(S*Pin)
Lm– Maximum current A;Vm– Maximum voltage VS– Effective area of solar module m^2Pin– input power of sunlight W/m^2
Efficient: Normally 15% China: 17% (Shang De) MAX: 25%
2008 Rensselaer Polytechnic Institute (RPI)Produce: A new antireflective coating (only 3.79% of the Sunlight was reflected and unhavested)
• Environment-friendly product• Save money • Use the natural source • Sunshine almost exit in everywhere• An sustainable energy & renewable
energy sources
advantage
From 1972 to 1997, scientist decline the price about make solar battery from $50 per W to $ 5 per W
USD $70
Product in ChinaPower: 1.3WSolar battery: 5.5V 200mABattery capacity: 4000mAhInput voltage: 400~800mA (max: 1.2A)Output voltage: 5V, 9V
120*75*12mmWeight: 156gCharging time(to cellphone): 120minCharging time(to inner battery): 18~20hUSD $18
Compare
Weight: 65g
156g
Price: $70 $18
Battery capacity: 1500mAh 4000mAh
Charging time(to inner battery): 8h 18~20h
BAD NEW?!
------Some technology limit and weak about solar energy and solar products
Disadvantage1:limitation
2:portability
3:fungible
LimitationWeather limitation under the sun. under bright light.Gender limitation
PortabilityWeight: solar charger--- 65g-850g cell phone -----
iphone 5 112gNokia n8 00 135gSamsung Galaxy S III 133g
Fungible1 :Car charger
2: Backup battery
3: Original charger
4: Portable charger
Portable charger
Conclusion Cost
($50)Awareness
(advertisement)portable
(65g)Reputation(reliable) (free
to use)It should has a big market!
Question time.
Thank you for your listening!