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    • 1. 发明授权
    • Temperature stabilized constant fraction voltage controlled current
source
    • 温度稳定恒定分数电压控制电流源
    • US5672961A
    • 1997-09-30
    • US581131
    • 1995-12-29
    • David W. EntrikinBrent R. JensenBenjamin J. McCarroll
    • David W. EntrikinBrent R. JensenBenjamin J. McCarroll
    • G05F1/56G05F3/22G05F3/26
    • G05F3/265G05F3/225
    • A current source includes a control stage responsive to a stable, d.c. input voltage that is operative to produce a control voltage proportional to absolute temperature (PTAT), and an output stage responsive to the PTAT control voltage that is operative to produce an output current that is an essentially constant fraction of an output constant current source. The control stage includes a temperature-dependent control resistor of a given resistor type, and at least one control constant current source providing the control resistor with a temperature dependent control current. The temperature dependent current source includes a temperature dependent current source resistor based on the given resistor type such that the temperature dependencies of the control current and the control resistor tend to cancel in such a manner that a true PTAT control voltage is developed. The output stage includes an output transistor coupled to an output constant current source such that an output current of the output stage has no current contribution other than from the output current source. A method for providing a current that is a constant fraction of an output constant current source includes the steps of: (a) developing a control current that is based on the same resistor type as a control resistor; (b) applying the control current to the control resistor to develop a control voltage that is proportional to absolute temperature; and (c) applying the control voltage to a current divider coupled to an output constant source to provide an output current.
    • 电流源包括响应于稳定的直流电的控制级。 可操作地产生与绝对温度(PTAT)成比例的控制电压的输入电压,以及响应于PTAT控制电压的输出级,该输出级用于产生输出电流源,输出电流基本上是恒定分量的输出恒定电流源。 控制级包括给定电阻器类型的温度依赖性控制电阻器和至少一个控制恒流源,为控制电阻器提供温度依赖控制电流。 温度相关电流源包括基于给定电阻器类型的温度依赖电流源电阻器,使得控制电流和控制电阻器的温度依赖性倾向于消除真正的PTAT控制电压的方式。 输出级包括耦合到输出恒定电流源的输出晶体管,使得输出级的输出电流除了来自输出电流源之外没有电流贡献。 提供作为输出恒流源的恒定分量的电流的方法包括以下步骤:(a)开发基于与控制电阻器相同的电阻器类型的控制电流; (b)将控制电流施加到控制电阻器以产生与绝对温度成比例的控制电压; 和(c)将控制电压施加到耦合到输出恒定源的分流器以提供输出电流。
    • 2. 发明授权
    • Calibration of integrated circuit time constants
    • 校准集成电路时间常数
    • US06842710B1
    • 2005-01-11
    • US10226911
    • 2002-08-22
    • Mark Richard GehringBrent R. Jensen
    • Mark Richard GehringBrent R. Jensen
    • G01R31/28H03H11/12G01R35/00
    • H03H11/1291G01R31/2884H03H2210/021H03H2210/043
    • A method and system for calibrating a time constant within an integrated circuit. A voltage storage element is charged, and the time required to achieve a reference voltage on the storage element is measured. The measured time is compared to a desired time. It necessary, an adjustable impedance is modified to change the charging time, and the cycle may be repeated until the charging time matches the desired time. In this novel manner, an actual RC time constant, as rendered in a particular integrated circuit, is measured and potentially adjusted to match a desired time constant. Advantageously, configuration information of the adjustable impedance may be communicated to other circuitry within the integrated circuit to enable such circuitry to implement the same RC time constant in analog signal processing. Consequently, embodiments of the present invention overcome incidences of wide tolerance in passive components implemented in integrated circuits. Beneficially, no external test equipment is required.
    • 用于校准集成电路内的时间常数的方法和系统。 电压存储元件被充电,并且测量在存储元件上实现参考电压所需的时间。 将测量的时间与期望的时间进行比较。 必要时修改可调阻抗以改变充电时间,并且循环可以重复,直到充电时间与期望的时间匹配。 以这种新颖的方式,如在特定集成电路中呈现的实际RC时间常数被测量并且可能被调整以匹配期望的时间常数。 有利地,可调节阻抗的配置信息可以被传送到集成电路内的其他电路,以使得这样的电路能够在模拟信号处理中实现相同的RC时间常数。 因此,本发明的实施例克服了在集成电路中实现的无源部件中的宽容差的发生。 有利的是,不需要外部测试设备。
    • 6. 发明授权
    • Temperature compensated logarithmic detector
    • 温度补偿对数检测器
    • US5677561A
    • 1997-10-14
    • US599093
    • 1996-02-07
    • Brent R. Jensen
    • Brent R. Jensen
    • G06G7/24H03G3/30H03G7/00H01L31/058
    • H03G3/3042G06G7/24H03G3/3047H03G7/001
    • A temperature compensated logarithmic detector biased with a proportional to absolute temperature (PTAT) voltage produced in accordance with an area ratio of biasing transistors is disclosed. According to one implementation of the invention, the temperature compensated logarithmic detector includes biasing circuitry and a logarithmic detector cell. The biasing circuitry receives an input signal and produces a PTAT bias voltage from the input signal. The PTAT characteristic of the PTAT bias voltage is produced by an area ratio. The logarithmic detector cell converts the input signal to a logarithmic output signal in accordance with a logarithmic transfer function over a narrow range.
    • 公开了一种根据偏置晶体管的面积比产生的与绝对温度(PTAT)成正比的温度补偿对数检测器。 根据本发明的一个实施方式,温度补偿对数检测器包括偏置电路和对数检测器单元。 偏置电路接收输入信号并从输入信号产生PTAT偏置电压。 PTAT偏置电压的PTAT特性由面积比产生。 对数检测器单元根据对数传递函数在窄范围内将输入信号转换成对数输出信号。
    • 7. 发明授权
    • Frequency offset and method of offsetting
    • 频偏和抵消方法
    • US07564923B2
    • 2009-07-21
    • US11261166
    • 2005-10-27
    • Mark R. GehringRussell R. MoenBrent R. Jensen
    • Mark R. GehringRussell R. MoenBrent R. Jensen
    • H04L27/12H04L27/20
    • H04L27/2092
    • A transmitter digital signal processor (DSP) circuit has a transmit frequency represented by n-bit data output from a look up table (LUT). The n-bit data is outputted to an n-bit accumulator structured to overflow at a rate based on the output n-bit data to output a phase. The circuit further has device structured to add an n-bit signed constant to the accumulator to offset the frequency represented by the n-bit data output from the LUT. A transceiver on a semiconductor chip may include as part of a transmitter circuit, a transmit DSP circuit that has the LUT, accumulator and device providing an n-bit signed constant to the accumulator to offset a transmit frequency in order to allow a receiver circuit on the transceiver to communicate directly with the transmitter circuit, and thus allowing testing of the transceiver.
    • 发射机数字信号处理器(DSP)电路具有由查找表(LUT)输出的n位数据表示的发射频率。 n比特数据被输出到构成为以基于输出n比特数据的速率溢出的n比特累加器,以输出相位。 电路还具有被构造为向累加器添加n位有符号常数以便偏移由LUT输出的n位数据表示的频率的器件。 半导体芯片上的收发器可以包括作为发射机电路的一部分的发射DSP电路,其具有LUT,累加器和设备向累加器提供n位有符号常数以偏移发射频率,以允许接收机电路 收发器与发射机电路直接通信,从而允许对收发器进行测试。
    • 10. 发明授权
    • Methods and apparatus for signal amplitude control systems
    • 信号幅度控制系统的方法和装置
    • US5724003A
    • 1998-03-03
    • US581033
    • 1995-12-29
    • Brent R. JensenJames W. H. Marsh
    • Brent R. JensenJames W. H. Marsh
    • G06G7/24H03G3/30H03G7/00
    • G06G7/24H03G3/3042H03G3/3047H03G7/001
    • A method for obtaining a rectified signal from a first alternating current signal. The method includes the step of inputting the first alternating current signal into a variable gain amplifier to obtain a second alternating current signal. The second alternating current signal has a substantially constant peak-to-peak voltage irrespective of a power level of the first alternating current signal. The method further includes the step of rectifying the second alternating current signal, using a power detector circuit, to obtain the rectified signal, whereby a direct current level of the rectified signal is substantially proportional to the power level of the first alternating current irrespective of the power level of the first alternating current. The rectified signal may then be employed in, for example, a feedback control circuit to control the amount of power output by an RF signal source.
    • 一种从第一交流信号获得整流信号的方法。 该方法包括将第一交流信号输入到可变增益放大器以获得第二交流信号的步骤。 与第一交流信号的功率电平无关,第二交流信号具有基本恒定的峰 - 峰电压。 该方法还包括使用功率检测器电路对第二交流信号进行整流以获得整流信号的步骤,由此整流信号的直流电平基本上与第一交流电的功率电平成比例,而与 第一交流电的功率电平。 然后,经整流的信号可以用于例如反馈控制电路中,以控制由RF信号源输出的功率量。