tiếp adc analog to digital converter

... levels is the focus of this paper In order to obtain samples efficiently, the levels need to be appropriately assigned in the analog- to- digital converter (ADC) When they are not within the amplitude ... schemes known all along Before delving into this implementation, we will touch upon a conceptual design of the level-crossing analogto -digital converter (LC ADC) The organization of the paper is ... flash-type LC ADC with a comparator bandwidth of kHz is compared to a 4-bit and a 3-bit conventional ADC with the same sampling frequency of kHz In order to keep the comparison fair, all comparators in...

Ngày tải lên: 22/06/2014, 01:20

... the digital modulation sequences, as in (36), is preferable from a noise perspective CONCLUSION In this paper, a new general formulation of analog- to- digital converters using parallel ΣΔ-modulators ... and FBDM ADCs Also, an example is provided of how the formulation can be used to derive a new architecture that is insensitive to channel matching errors Example (TIM ADC) Consider a TIM ADC [3, ... to the modulator, and are for this reason particularly attractive on the analog side A channel-specific gain γk is included in the sensitivity analysis, and analog imperfections in the modulator...

Ngày tải lên: 22/06/2014, 19:20

... detail s MOTOROLA 1-3 SECTION Conventional Analog- to- Digital Converters “Most A/D converters can be classified into two groups according to the sampling rate criteria: Nyquist rate converters ... MOTOROLA References-1 iii Illustrations Figure 2-1 Generalized Analog- to- Digital Conversion Process 2-2 Figure 2-2 Conventional Analog- to- Digital Conversion Process 2-3 Figure 2-3 Spectra of Analog ... Motorola Digital Signal Processors Principles of Sigma-Delta Modulation for Analog- toDigital Converters by Sangil Park, Ph D Strategic Applications Digital Signal Processor Operation MOTOROLA...

Ngày tải lên: 04/07/2014, 07:24

... of ADC result movf movwf movf movwf return adc_ result,w adc_ templ adc_ result+1,w adc_ temph ; ; ; ; ; move adc_ result LSB into W save W into temp register move adc_ result MSB into W save W into ... 0x01 adc_ result+1,f D’56’ adc_ result,f STATUS,C adc_ result+1,f ; ; ; ; ; ; ; add into hundreds move literal into W subtract 200 from adc_ result MSB move remainder into W add remainder 56 into adc_ result ... 0x30 adc_ temph ; ; ; ; ; ; ; linker to select GPR bank move copy of adc_ result LSB into W make copy ADC result LSB move copy of adc_ result MSB into W make copy ADC result MSB move literal into...

Ngày tải lên: 11/01/2016, 11:34

... correlated noise, i.e distortion created by the converter itself With delta-sigma analog- to- digital converters, there is a subset of this distortion referred to as idle tones These idle tones are a by-product ... DitherCH1(ON); Noise Reduction and Idle Tones All analog- to- digital converters create noise during the conversion process Some of this noise is quantization noise, due to the conversion process itself ... ModulatorCH0(OFF); ON, OFF Modulator output setting for CH0 ModulatorCH1(OFF); ON, OFF Modulator output setting for CH1 WidthCH1(24); Note 1: An 8-bit wide unsigned integer is passed to SetOSR...

Ngày tải lên: 11/01/2016, 16:55

... possible, avoid any digital output next to analog inputs Avoid digital inputs that switch frequently (e.g., clocks) next to analog inputs If VREF is used, then ensure that no analog pin being sampled ... required to charge the on-chip holding capacitor to the same value as is on the analog input pin The sampling time depends on the magnitude of the holding capacitor and the source impedance of the analog ... threshold (Figure 14) Analog input to A/D converter Data bus VDD In power-sensitive applications, the RA pins, when used as analog inputs, should be configured as "analog" to avoid unintended power...

Ngày tải lên: 11/01/2016, 11:50

... ADCL ADC Data Register - ADCH and ADCL (ADLAR = 1) ADC9 ADC8 ADC7 15 ADC1 ADC6 ADC5 ADC4 ADC3 ADC2 ADCH ADC0 FIGURE 3.10: ADC registers - - - - - ADCL ANALOG- TO- DIGITAL CONVERSION The REFS[1:0] ... Register A - ADCSRA ADEN ADSC ADATE ADIF ADIE ADPS2 ADPS1 ADPS0 ADC Data Register - ADCH and ADCL (ADLAR = 0) 15 ADC7 - - - - - ADC6 ADC5 ADC4 ADC3 ADC2 ADC9 ADC8 ADCH ADC1 ADC0 ADCL ADC Data ... implementation ANALOG- TO- DIGITAL CONVERSION 3.3.2 Integration The integration technique uses an integrator, a comparator, and a controller to convert analog signals to digital signals A sampled analog signal...

Ngày tải lên: 29/09/2013, 20:20

... CRC Press LLC 5.4 Analog- to- Digital Converter Architectures The analog- to- digital (A/D) converter, also known as an ADC, encodes an analog signal into a digital word Conventional converters work ... of process parameters 5.3 Digital -to -Analog Converter Architecture The digital -to -analog (D/A) converter, also known as a DAC, decodes a digital word into a discrete analog level Depending on ... applied to an analog- to- digital converter (A/D) circuit where the sampled analog signal is converted to a digitally coded signal The digital signal is then applied to c 1999 by CRC Press LLC the digital...

Ngày tải lên: 27/01/2014, 03:20

... Analog- to- Digital Conversion Using IF Networks 2067 N-bit ADC Switch RF N-bit ADC Multiplexer Demultiplexer Input theory, the sampling rate can be increased by a factor equal to the number ... compared to their firing rates Given the limitations of a single neuron, it is remark- Comparator − + N-bit ADC Figure 1: A typical scheme for increasing the sampling rate is to use multiple analog- to- digital ... integrator, quantizer, and digitalto -analog converter (DAC) in Figure can be represented by the integrating amplifier, comparator, and switch, respectively, in Figure A Σ − ∆ converter is a type of...

Ngày tải lên: 23/06/2014, 01:20

... chuyển đổi tương tự số adc (analog- digital converter) Hình 7.1:Sự lượng tử hóa Hình 7.2 s(t) dạng digital cho đổi ADC bit bit Hình 7.2:Thí dụ A/D Mách lượng tử hoá ... đổi tương tự số adc (analog- digital converter) Một mạch A/D to n tín hiệu mẫu cần 4.000 số đếm Tín hiệu tích phân cho 1/4 chu kỳ này, tức 1.000 số đếm Một tích phân thứ hai autozero cần giữ 3.000 ... Hình 7.3 vẽ khối lượng từ hoá đếm 3/10 chuyển đổi tương tự số adc (analog- digital converter) Hình 7.3: Lượng tử hóa đếm Ramp generator ( mạch tạo đường dốc ) bắt đầu điểm lấy mẫu Mạch eâm bắt...

Ngày tải lên: 31/12/2015, 16:37

... cách khác, “số hóa” (digitalize) liệu analog thành liệu digital Quá trình “số hóa” thường thực thiết bị gọi “bộ chuyển đổi tương tự - số hay đơn giản ADC (Analog to Digital Converter) Phùng Tấn ... ext_int_edge(h _to_ l); enable_interrupts(int_ext); enable_interrupts(global); setup _adc_ ports(ALL _ANALOG) ; setup _adc( ADC_CLOCK_INTERNAL); set _adc_ channel(3); delay_ms(10); while (1) { a=read _adc( ); for(b=1;b

Ngày tải lên: 23/04/2014, 23:57

... The author, publisher, and distributors disclaim all liability and responsibility to any person or entity with respect to any loss or damage caused, or alleged to be caused, directly or indirectly, ... ADC and DAC 35 Quantization 35 The Sampling Theorem 39 Digital -to -Analog Conversion 44 Analog Filters for Data Conversion 48 Selecting the Antialias Filter 55 Multirate ... book to solve a specific problem Support by Analog Devices The Second Edition of this book includes two new chapters on Digital Signal Processors, microprocessors specifically designed to carry...

Ngày tải lên: 13/09/2012, 10:21

... signal It is this signal that is sampled and converted to a discrete-time signal and coded to a digital signal by the analog- to- digital converter (ADC) that was briefly discussed earlier in this chapter ... example of a digital lowpass filter is shown in Figure 1.15 The output of the digital filter is next fed to a digital -to -analog converter (DAC) as shown in Figure 1.17 that also uses a lowpass analog ... Processor Analog Output y(t) Figure 1.16 Example of an analog signal processing system ANALOG AND DIGITAL SIGNAL PROCESSING Analog Preconditioning Analog Input Low Pass Filter x(t) Sample and Hold ADC...

Ngày tải lên: 13/09/2012, 10:21

... Thermistor B = 3000 ->5000 : thermistor đo nhiệt độ thấp B = 6000 ->13000 : thermistor đo nhiệt độ cao Khi nhiệt độ giảm độ nhạy Thermistor tăng.Đó ưu điểm nhiệt kế Phạm vi sử dụng thermistor từ ... transistor, IC chuyên dùng b-Khâu xử lý: Các thông số điện sau chuyển đổi từ nhiệt độ xử lý trước qua đến phần thò Các phận khâu xử lý gồm có: phần hiệu chỉnh, khuếch đại, biến đổi ADC (Analog- Digital- Converter) … ... TUYẾN R(T) = Ro.F(T – To) Với : Ro :điện trở nhiệt độ To F : hàm phụ thuộc vào đặc tính vật liệu F = T = To -Đối với điện trở kim loại : R(T) = Ro( + AT + BT2 + CT3) T : tính 0C To = 00C -Đối với...

Ngày tải lên: 24/04/2013, 16:24

... signal It is this signal that is sampled and converted to a discrete-time signal and coded to a digital signal by the analog- to- digital converter (ADC) that was briefly discussed earlier in this chapter ... example of a digital lowpass filter is shown in Figure 1.15 The output of the digital filter is next fed to a digital -to -analog converter (DAC) as shown in Figure 1.17 that also uses a lowpass analog ... Processor Analog Output y(t) Figure 1.16 Example of an analog signal processing system ANALOG AND DIGITAL SIGNAL PROCESSING Analog Preconditioning Analog Input Low Pass Filter x(t) Sample and Hold ADC...

Ngày tải lên: 29/09/2013, 21:20

... Dashboard Factory Factory Exchange 2000 Server Exchange 2000 Server Digital Digital Dashboard Dashboard Factory Factory Digital Dashboard Store (Contains Web Parts) Digital Dashboard Store (Contains ... dashboard logic tier Digital Digital Dashboard Dashboard Factory Factory SQL Server 7.0 SQL Server 7.0 Digital Digital Dashboard Dashboard Factory Factory Digital Dashboard Store (Contains Web ... Protocol (HTTP) and WebDAV protocols 21 22 Module 1: Introduction to Digital Dashboards Introduction to the Digital Dashboard Storage Tier Slide Objective To present the digital dashboard storage...

Ngày tải lên: 19/10/2013, 02:15

... Call to action A CTA is a phrase written to motivate the reader to take action (sign up for our B2C Stands for Business to consumers When businesses sell products/services to consumers means to ... sent to someone who has not requested to receive it - EVIL! The first email spam dates back to 1978 Spam is defined as unsolicited commercial or bulk email, and today is said to account for 80 to ... people how to link to you, and ensuring that search If people find your site useful, they are more likely to link to it It is not necessary, nor engines notice your authority possible, to try to write...

Ngày tải lên: 29/10/2013, 09:46

... book to unify the set of engineering simplifications made in both analog and digital design The book elevates the focus of the digital domain to that of analog However, our treatment of digital ... fundamentals of modern analog and digital integrated circuits I applaud their decision to eliminate from their book the usual mandatory chapter on Laplace transforms, a tool no longer in use by ... circuits and electronics without regard to the digital domain must be replaced by one that stresses the circuits foundations common to both the digital and analog domains Because most of the fundamental...

Ngày tải lên: 09/01/2014, 17:03