摘要:
A signal processing system allows reconstruction of a non-uniformly sampled analog signal including sampling an analog signal at a sampling period of resulting in a quantized non-uniformly sampled signal. The non-uniformly sampled signal includes a sampled signal and an amplitude error between a signal sampled with the equidistant sample period and the non-uniformly sampled signal. A reconstructed amplitude error is determined through the time offset and the non-uniformly sampled signal, and is subtracted from the non-uniformly sampled signal. The signal processing system may be implemented in an electrocardiogram monitoring device or a mobile phone device.
摘要:
An amplifier for amplifying a signal which is applied to a signal input having a first pair of transistors (10), which is connected to the signal input and which contains two transistors (10-1, 10-2), currents flowing through the two transistors (10-1, 10-2) which have a specific operating current ratio (m) in relation to one another, a second pair of transistors (4), which is connected to the first pair of transistors (10) and which contains two transistors (4-1, 4-2), currents flowing through the two transistors (4-1, 4-2) which have the same operating current ratio (m) in relation to one another, and a signal output (3) of the amplifier (1) being provided between the first pair of transistors (10) and the second pair of transistors (4).
摘要:
A circuit arrangement for generating switch-on signals for driving track-and-hold elements of an analog-to-digital converter operating with interleaved timing comprises a first input for inputting a common reference clock signal, at least one window device for generating clock signals which are interleaved with respect to one another in terms of timing and whose respective time windows in which the respective of the clock signals has a first logic level are derived from the reference clock signal, and at least one gate device for generating a switch-on signal. The gate device is connected downstream of the window device and combines logically the reference clock signal with a respective of the clock signals and with a further information item so that a time window of the switch-on signal is at least longer than the window of the reference clock signal.
摘要:
Time-continuous sigma/delta analog-to-digital converter for converting an analog input signal into a digital output signal (D), having at least one analog filter (3) which filters the analog input signal present at a signal input (2) of the analog filter (3), a quantizer (12) which is clocked by a clock signal (CLK) and quantizes the filtered analog signal, output by the analog filter (3), in order to generate the digital output signal (D), and having at least one reference capacitor (28) which can be continuously charged to a reference voltage (VREF) by a current source (31) for displacing a constant charge (Q) to/from the analog filter (3), such that no voltage jumps occur at the analog filter (3).
摘要翻译:一种用于将模拟输入信号转换为数字输出信号(D)的时间连续的Σ/Δ模数转换器,具有至少一个模拟滤波器(3),其对存在于信号输入端(2)的模拟输入信号进行滤波, 模拟滤波器(3)的量化器(12),由时钟信号(CLK)计时并量化由模拟滤波器(3)输出的经滤波的模拟信号,以产生数字输出信号(D) ,并且具有至少一个参考电容器(28),其可以通过电流源(31)连续地充电到参考电压(V SUB REF),用于将恒定电荷(Q)移位到/ 模拟滤波器(3),使得在模拟滤波器(3)处不发生电压跳变。
摘要:
A circuit arrangement (10) for compensating for nonlinearities (NL1, NL2) from analog/digital converters (15, 16) operating with different timing, having at least two analog/digital converters (15, 16) which are each clocked with different timing and which each have a predetermined nonlinear converter characteristic with integral nonlinearities (NL1, NL2), and which accept an analog input signal (VIN) applied to an input (11) on the circuit arrangement and respectively convert it into a digital intermediate signal (Z1, Z2); and having a multiplexer (22) which is arranged downstream of the analog/digital converters and which successively switches through the digital intermediate signals (Z1, Z2) in order to produce a digital output signal (ZD) from the circuit arrangement (10); where at least one of the nonlinear converter characteristics of the various analog/digital converters (15, 16) is predetermined such that after the intermediate signals have been combined in the multiplexer (22) the integral nonlinearities (NL1, NL2) in the various analog/digital converters (15, 16) essentially compensate for one another.
摘要:
Circuit arrangement (1) for the delay adjustment of analog-to-digital converters (4-1, . . . 4-N, 504) operating in a temporally offset manner, having at least two analog-to-digital converters (4-1, . . . 4-N, 504) each having a signal path, which receive an analog signal (VI) present at an input (2) of the circuit arrangement (1) and in each case convert it into a digital intermediate signal (Z1, . . . ZN), the analog-to-digital converters (4-1, . . . 4-N, 504) in each case being clocked by clock signals (CLK1, . . . CLKN) which have a predetermined time offset with respect to one another; having a logic circuit (7), which interconnects the digital intermediate signals (Z1, . . . ZN) for the purpose of generating a digital output signal (ZD) of the circuit arrangement (1); it being possible to set the bandwidth of the signal paths of the analog-to-digital converters (4-1, . . . 4-N, 504) in each case in such a way that a deviation of the clock signal (CLK1, . . . CLKN) from the predetermined time offset for the respective analog-to-digital converter (4-1, . . . 4-N, 504) is compensated for by a change in the bandwidth of at least signal path.
摘要:
An arrangement for a time interleaved analog-to-digital converter that converts an signal to a digital signal and has a converter array with a plurality of analog-to-digital converters arranged in a fixed sequence in parallel with one another and can be operated with staggered timing with respect to one another is disclosed. The arrangement has a connection network which, for the purposes of actuation with staggered timing, generates in each case one control signal for an individual analog-to-digital converter in each case, with the connection network predefining the time sequence with which the control signals actuate the individual analog-to-digital converters in such a way that owing to this sequence of the control signals and thus the sequence of the actuated individual analog-to-digital converters there is at least a reduction in an interference spectrum in the spectrum of the input and/or output signal. A sorting method for operating this analog-to-digital converter is also disclosed.
摘要:
A circuit arrangement (10) for compensating for nonlinearities (NL1, NL2) from analog/digital converters (15, 16) operating with different timing, having at least two analog/digital converters (15, 16) which are each clocked with different timing and which each have a predetermined nonlinear converter characteristic with integral nonlinearities (NL1, NL2), and which accept an analog input signal (VIN) applied to an input (11) on the circuit arrangement and respectively convert it into a digital intermediate signal (Z1, Z2); and having a multiplexer (22) which is arranged downstream of the analog/digital converters and which successively switches through the digital intermediate signals (Z1, Z2) in order to produce a digital output signal (ZD) from the circuit arrangement (10); where at least one of the nonlinear converter characteristics of the various analog/digital converters (15, 16) is predetermined such that after the intermediate signals have been combined in the multiplexer (22) the integral nonlinearities (NL1, NL2) in the various analog/digital converters (15, 16) essentially compensate for one another.
摘要:
Bandgap reference current source for generating a reference current (IREF) having: at least two bipolar transistors (T1, T2), the base terminals (B1, B2) of which are interconnected and connected to a fixed reference potential, the collector terminals (C1, C2) of which are connected to a collector current ratio setting circuit (15, 16), which sets a specific current ratio (m) between the two collector currents (IC1, IC2) flowing through the collector terminals (C1, C2), and the emitter terminals (E1, E2) of which are connected via a first resistor (RA) to a current node (13) which adds the emitter currents (IE1, IE2) flowing through the emitter terminals (E1, E2) to form a summation current (ISUM), which forms the reference current (IREF).
摘要:
Circuit arrangement (1) for the delay adjustment of analog-to-digital converters (4-1, . . . 4-N, 504) operating in a temporally offset manner, having at least two analog-to-digital converters (4-1, . . . 4-N, 504) each having a signal path, which receive an analog signal (VI) present at an input (2) of the circuit arrangement (1) and in each case convert it into a digital intermediate signal (Z1, . . . ZN), the analog-to-digital converters (4-1, . . . 4-N, 504) in each case being clocked by clock signals (CLK1, . . . CLKN) which have a predetermined time offset with respect to one another; having a logic circuit (7), which interconnects the digital intermediate signals (Z1, . . . ZN) for the purpose of generating a digital output signal (ZD) of the circuit arrangement (1); it being possible to set the bandwidth of the signal paths of the analog-to-digital converters (4-1, . . . 4-N, 504) in each case in such a way that a deviation of the clock signal (CLK1, . . . CLKN) from the predetermined time offset for the respective analog-to-digital converter (4-1, . . . 4-N, 504) is compensated for by a change in the bandwidth of at least signal path.