Week #4: Discussion results

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!