TW201242252A - Output input interface apparatus and voltage level shifter thereof - Google Patents

Abstract

A voltage level shifter for receiving an input signal and shift a voltage level thereof to generate an output signal at an output terminal is disclosed. The voltage level shifter includes a path circuit, an inverting circuit and a voltage pull circuit. The path circuit receives the input signal and a first reference voltage and turning on or off a connection between the output terminal and the path circuit. The input signal is a digital signal transited between a ground voltage and a second reference voltage. The inverting circuit receives and converts the input signal to generate a control signal transited between the ground voltage and the first reference voltage. The voltage pull circuit receives the first reference voltage and the control signal for pulling the output signal to the first reference voltage.

Description

201242252 uyy〇i2 37081twf.doc/I VI. Description of the Invention: [Technical Field] The present invention relates to an output input interface device comprising a voltage level shifter and an applied voltage level shifter. [Prior Art] In today's rapid advancement in electronic technology, integrated electronic products with multiple functions have become the focus of market pursuit. In order to achieve a wide range of functions in a single product, switching between different operating voltage ranges is a basic technology required for such products. The principal angle ' used to perform the conversion of this operating voltage range is the so-called voltage level shifter. Please refer to FIG. 1. FIG. 1 is a schematic diagram of a conventional voltage level shifter 100. The voltage level shifter 1A is composed of transistors MP1 to MP3 and MN1 to MN3. The voltage level shifter 1 receives an input signal IN between the reference voltage VDD and the ground voltage GND, and converts the input signal IN to generate an output signal OUT (the reference voltage between the reference voltage VCC and the ground voltage GND) VCC and VDD

The pressure level is not the same). Wherein, when the input signal IN is equal to the ground voltage GND, the transistor MN3 receives the output of the inverter composed of the transistors MP1 and MN1 (equal to the reference voltage VDD) and is turned on, and at the same time, the output signal OUT is transmitted through the turned-on transistor MN3. Pull low to be equal to the ground voltage GND. Conversely, when the input signal IN is equal to the reference voltage VDD, the power 4 201242252

099012 37081twf.doc/I The crystal MN2 is turned on equal to the input signal IN of the reference voltage vDD, and the gate of the transistor MP3 is pulled down to be equal to the ground voltage GND due to the conduction of the transistor MN2, and is thereby turned on. At this time, the output signal 〇υτ is pulled high through the turned-on transistor MP3 to be equal to the reference voltage VCC. Although the above-mentioned voltage level shifter 100 can effectively achieve the transfer of the voltage bar 15 between signals, it requires six electric (four) to effectively operate on the circuit layout, and needs to occupy a large area, which is invisibly increased. The production cost of the circuit. In addition, the voltage level shifter is required to pull up the electric field of the output signal 〇υτ through the intersecting transistors MP2 and MP3, so that the transition speed is limited. SUMMARY OF THE INVENTION The invention provides - (iv) a pressure level shift 11 for closing the voltage swing of the input signal to produce a low Wei (s) output signal. The invention provides a kind of electric fresh-position transfer device, which uses the voltage swing of the input signal to generate an output signal with a higher voltage swing, which is provided by the supply-seam_human Jieling, and has a higher electric power = Zhongtian The external signal is used to generate an internal input with a lower voltage swing = or to adjust an internal output signal with a lower slew to generate an external signal with a vehicle-to-voltage swing. The invention proposes a voltage level shifter for receiving and transferring. The voltage level of the number is used to generate the round signal at the input (four). The voltage level converter includes a path circuit, a reverse circuit, and a pull-up circuit. The path circuit is coupled to the output terminal for receiving the input signal and the first reference voltage, and

201242252 099012 37081 twf.doc/I Connects to the output according to the input signal and the first reference voltage. The input signal is a digital signal that is transitioned between the ground voltage and the second reference voltage, and the voltage level of the first reference voltage is less than the voltage level of the second reference voltage. The inverting circuit receives the input signal and inverts the input signal and converts the input signal to a digital signal that transitions between the ground voltage and the first reference voltage to generate a control signal. The pull-up circuit is coupled to the path circuit and the reverse circuit. The pull-up circuit receives the first reference voltage and the control signal, and pulls the output signal to the first reference voltage according to the control signal. The invention further provides a voltage level shifter that receives and transfers the voltage level of the input to generate an output signal at the output. The voltage level thief includes a path circuit, a reverse circuit, and a pull-up circuit. The path circuit is connected to the output terminal for receiving the input signal and the first reference voltage, and adjusting the equivalent impedance between the path circuit and the output terminal according to the Qin input signal. Among them, the race signal is the digit ## between the ground voltage and the first reference voltage. The reverse circuit _ to the path circuit receives the input signal and the second reference voltage. The reverse circuit converts the input signal into a digital signal that is grounded between two reference voltages to generate a control signal. The voltage of the second reference circuit > 1 is greater than the voltage level of the first reference voltage. The electric circuit is connected to the path circuit and the reverse circuit, and receives the second reference voltage and the control ## to pull up the output signal to the second reference voltage according to the control signal. The tree is used to transmit or block the path of the input signal to the output, and the reverse circuit is used to generate the number 're-transmission circuit according to the voltage level of the input signal. Come to the job in the input signal to the output 6 6 201242252

099012 37081twf.doc/I When the voltage level of the output terminal is pulled up, the reference voltage (the voltage reference voltage) is required, and the level of the generated output signal is shifted to the required electric dust level. . The voltage level transfer provided by the present invention reduces the need to use a small number of transistors, thereby effectively saving circuit area. The above described features and advantages of the present invention will become more apparent from the description of the appended claims. [Embodiment] Please refer to FIG. 2. FIG. 2 is a schematic diagram of a voltage level shifter 200 according to an embodiment of the present invention. The voltage level shifter 2 includes a path circuit 210, a reverse circuit 220, and a pull-up circuit 23A. The voltage level shifter 200 receives the input signal ΙΝ and generates an output signal OUT at the output terminal 〇τ of the voltage level shifter 2〇〇 by shifting the voltage level of the input signal m. In this embodiment, the input signal ΙΝ is a digital signal that transitions between the reference voltage VCC and the ground voltage GND, and the output signal 〇υτ is a digital signal that transitions between the reference voltage VDD and the ground voltage GND. Moreover, the voltage level of the reference voltage VDD is less than the voltage level of the reference voltage vcc. The path circuit 210 is drained to the output terminal OT of the voltage level shifter 2A, and receives the input 彳§IN and the reference voltage VDD. The path circuit 210 turns on or off the connection with the output terminal OT in accordance with the received input signal IN and the reference voltage VDD. That is, when the path circuit 21 is turned on according to the input signal IN and the reference voltage VDD, the input signal IN is transmitted through the path circuit 210 to the output terminal 〇τ to become an output signal 201242252

Uyyuiz 37081twf.doc/I OUT. Conversely, when the path circuit 210 is turned off in accordance with the input signal IN and the reference voltage VDD, the output signal out at the output terminal 〇τ is determined by the pull-up circuit 230. The reverse circuit 220 is coupled between the path circuit 210 and the pull-up circuit 230. The inverting circuit 220 receives the input signal IN and reverses and converts the input signal IN to a digital signal of a transition between the ground voltage GND and the reference voltage VDD to generate a control signal CTRL. The pull-up circuit 230 is coupled to the path circuit 210 and the reverse circuit 220 and coupled to the output terminal OT. The pull-up circuit 230 receives the reference voltage VDD and the control signal CTRL, and determines whether to pull up the output signal OUT on the output terminal OT to be equal to the reference voltage VDD specific point according to the control signal CTRL, when the input signal IN is equal to the reference voltage vcc The reverse circuit 220 correspondingly generates a control signal CTRL equal to the ground voltage GND. When the pull-up circuit 230 receives the control signal CTRL equal to the ground voltage GND, it pulls up the output signal on the connected output terminal 〇τ, which is equal to the reference voltage VDD. Conversely, if the input signal is equal to the ground voltage GND, the inverting circuit 22A correspondingly generates a control signal CTRL equal to the reference voltage VDD. When the pull-up circuit 230 receives the control signal CTRL equal to the reference and the voltage VDD, the operation is stopped (the output number out of the 4 οτ is not pulled up). At the same time, since the path circuit 210 directly transmits the input signal IN equal to the ground voltage GND to the output terminal 〇Τ, the output signal OUT is equal to the ground voltage GND. I will give a practical example to illustrate the details of the action of the voltage level shifter 2 0 。. The conversion voltage VDD is 3.3 volts (Volts, V) and the reference power 8 201242252 099012 37081 twf.doc / l voltage VCC is 6V as an example 'When the input signal IN is equal to the ground voltage GND (OV), the path circuit 21 turns on the input signal The connection between m and the output terminal is to directly transfer the connected (four) input (four) IN to the output terminal OT. In other words, when the input signal IN is equal to the ground voltage GND, the output 〇 〇UT is also equal to the ground voltage GND (OV). Incidentally, the reverse circuit 220 generates a control signal CTRL equal to 3 3 V at this time, and the pull-up circuit 230 receives a control signal CTRL equal to 3 3 V and does not pull up the output signal ο τ of the wheel terminal 〇Τ. That is, the output signal 0UT at this time is equal to the ground voltage GND (OV). In contrast, when the input signal IN is equal to the reference voltage VCC (6V), the path circuit 210 disconnects the input signal IN from the output terminal 〇τ. At the same time, the reverse circuit 220 generates a control signal CTRL' equal to 〇ν at this time, and the pull-up circuit 230 receives the control signal CTRL equal to ον, and pulls up the output signal ουτ of the output terminal OT to make the output signal 〇υτ It is pulled up to be equal to the reference voltage VDD (3.3V). It should be noted that, in the voltage level shifter 2A of the embodiment, the path circuit 210 can be constructed by using the via transistor MN21, wherein the control terminal (gate) of the via transistor MN21 receives the reference voltage VDd, The first end (source or drain) receives the input signal IN, and the second end (drain or source) is coupled to the output terminal 〇Τ. The reverse circuit 22 is composed of a reverse transistor MP21 and MN22 connected in series between the reference voltage VDd and the ground voltage GND. The control terminals (gates) of the reverse transistors MP21 and MN22 collectively receive the input signal IN. Moreover, the pull-up circuit 230 is constructed by the pull-up battery MP22, and its control terminal (gate) receives the control signal CTRL, which is

201242252 099012 37081twf.doc/I One end (source/drain) and the second end (汲/source) are respectively coupled to the reference voltage VDD and the output terminal 〇τ. In addition, in the present embodiment, the via transistor MN21 and the reverse transistor MN22 are N-type gold-oxygen half-field effect transistors, and the reverse transistor MP21 and the pull-up transistor Mp22 are p-type gold-oxygen half-field effects. Transistor. In combination with the above description, the voltage level shifter 2 of the present embodiment can transfer the voltage level of the input signal IN between the ground voltage GND (〇V) and the reference voltage VCC (6V), and An output signal OUT that is transitioned between the ground voltage GND (OV) and the reference voltage VDD (3 3V) is generated. The voltage level shifter 200 of the present embodiment requires only four transistors to be constructed, which is cost effective. Moreover, the voltage level shifter 200 of the present embodiment can directly pull up the output signal out to the reference voltage VDD by turning on the pull-up transistor MP22, thereby effectively reducing the required transition time of the output signal 〇υτ. Referring to Figure 3 below, Figure 3 is a schematic diagram of a voltage level shifter 300 in accordance with another embodiment of the present invention. The voltage level shifter 3A includes a path circuit 310, a reverse circuit 320, and a pull-up circuit 330. Voltage level shifter 3 00 receives and diverts the voltage level of input signal 以 to produce an output signal OUT at output 〇 τ. The input signal ΙΝ is a digital signal that transitions between the reference voltage VDD and the ground voltage GND, and the output signal out is a bit signal that transitions between the reference voltage vcc and the ground voltage GND. The voltage level of the reference voltage VCC is greater than the voltage level of the reference voltage V^D. The path circuit 310 is coupled to the output terminal 〇Τ. Path circuit 31〇 receiving 201242252

099012 3708Itwf.doc/I Input (4) IN and reference light VDD, and according to the input signal m, the equivalent impedance between the path circuit 310 and the output terminal. That is, when the input 仏唬IN is equal to the ground voltage GND, the equivalent impedance of the path circuit 310 is adjusted to a relatively low low impedance value, and the input signal IN can be directly transmitted to the wheel terminal 〇τ. In contrast, when the input signal IN is equal to the reference voltage VDD, the equivalent impedance of the path circuit 31 is adjusted to the south south impedance value. In this embodiment, the path circuit 310 includes the path transistor MP31 and the first end (source/no-pole) of the MN path transistor Mp31 receives the reference voltage VDD', and the second end (no/source) is connected to the path The transistor terminal (gate) of the transistor Na, the control transistor (gate) of the via transistor MP31 receives the input 唬IN. The first terminal (source/drain) of the via transistor MN3丨 receives the input signal IN, and the second terminal (汲/source) is coupled to the output terminal 〇τ. Wherein, when the input nickname IN is dedicated to the ground voltage GND (〇V), the via transistor MP31 is turned on correspondingly, and the reference voltage VDD (for example, 3 3v) is transmitted to the control terminal of the pass transistor MN31. At the same time, the pass transistor is turned on so that the equivalent impedance of the path circuit 310 is almost equal to 〇, and the input 仏 IN is directly transmitted to the output 〇τ (that is, the output signal out is equal to 0V). On the contrary, when the input signal IN is equal to the reference voltage VDD, the via transistor MP31 is turned off correspondingly, and the control terminal of the via transistor Mnm assumes a high impendence state. Therefore, the equivalent impedance provided by the transistor MN31 is relatively increased. The voltage level of ^ at this time can be determined by the pull-up circuit 330. ^ ~ 11

201242252 〇ywu 37081twf.doc/I The reverse circuit 320 is coupled to the path circuit 310 to receive the input signal IN and the reference voltage VCC. The inverting circuit 320 converts the input signal IN into a digital signal that transitions between the ground voltage GND and the reference voltage VCC, and thereby generates a control signal CTRL. The reverse circuit 320 includes reverse transistors MP32 and MN32. The control terminal (gate) of the reverse transistor MP32 is coupled to the output terminal OT, the first terminal (source/drain) is coupled to the reference voltage VCC, and the second terminal (no/source) generates a control signal CTRL. The first end (source/no-pole) of the reverse transistor MN32 consumes the second end of the reverse transistor Mp32, whose control terminal (gate) receives the input signal IN, and its second terminal (no/source) receives Ground voltage GND. When the input signal IN is equal to the ground voltage GND, the control terminal of the reverse transistor MP32 receives the input signal IN equal to the ground voltage GND transmitted from the via transistor MN31, and the reverse transistor Mp32 is turned on and generates a voltage equal to the reference voltage VCC. Control signal CTRL. In contrast, when the input nickname IN is equal to the reference voltage VDD, the control 蜢 of the reverse transistor MN32 receives the input signal IN equal to the reference voltage VDD and is turned on and generates a control signal CTRL equal to the ground voltage GND. The pull-up circuit 330 is coupled to the path circuit 310 and the reverse circuit 320, receives the reference voltage VCC and the control money CTRL, and pulls the finger (four) number QUT wire test voltage vcc according to the control signal CTRL. That is to say, when the field control 彳5 CTRL is equal to the ground voltage GND, the pull-up circuit 33 d dMs* CHJT is pulled up to be equal to the reference voltage vcc. When the control apostrophe CTRL is equal to the reference voltage vcc, the pull-up circuit 33 is disabled and does not operate. 201242252

099012 3708 ltwf.doc/I In the present embodiment, the pull-up circuit 330 includes a pull-up transistor mp33. The first end (source/no-pole) of the pull-up transistor MP33 is connected to the reference voltage vcc, the control terminal (gate) receives the control signal CTRL, and the second end (汲/source) is coupled to the output terminal OT. In the present embodiment, 'the pass transistor MP31, the reverse transistor MP32, and the pull-up transistor MP33 are P-type gold-oxygen half-field effect transistors, and the via transistor MN31 and the reverse transistor MN32 are N-type. Gold oxygen half field effect transistor. Here, the voltage level shifter 3 〇〇 requires only five electric crystals to operate, and also has a lower circuit cost. Moreover, the output signal 〇υτ is directly pulled up to the reference voltage VCUC by pulling up the transistor MP33, thus having a fast transition speed. In summary, the present invention utilizes a path circuit to select whether to directly provide an input signal to the output terminal of the voltage level shifter and to transmit through the path when the path circuit does not directly provide an input signal to the output of the voltage level shifter. The circuit is raised to pull up the output signal of the voltage level shifter so that the voltage level shifter can convert the transition voltage interval of the input signal. In addition to reducing the number of U-body required, it is more effective to improve the transition speed of the transmission and improve the efficiency of the transmission of the electric fresh-spot. Although the present invention has been disclosed in the above embodiments, it is not intended to be limiting, and any person having ordinary skill in the art can make a few changes and refinements without departing from the scope and scope. The scope of the patent application scope attached to the company is subject to the definition of patent application. [Simple description of the schema] 13 201242252

〇yyul2 37081twf.doc/I FIG. 1 is a schematic diagram of a conventional voltage level shifter 100. 2 is a schematic diagram of a voltage level shifter 200 according to another embodiment of the present invention. FIG. 3 is a schematic diagram of a voltage level shifter 300 according to another embodiment of the present invention. [Main component symbol description] 100, 200, 300: voltage level shifter 210, 310: path circuit 220, 320: reverse circuit 230, 330: pull-up circuit IN: input signal OT: output terminal VDD, VCC: reference Voltage GND: Ground voltage OUT: Output signal CTRL: Control signals MP1 to MP3, MN1 to MN3, MN2 Bu MN22, MP21, MP22, MP31 to MP33, MN31 to MN32: Transistor

Claims (1)

201242252 099012 37081twf.doc/I VII. Patent Application Range: 1. A voltage level shifter 'receives and transfers the voltage level of an input signal to generate an output signal at an output, including: a path circuit 'coupled Receiving the input signal and a first reference voltage 'and according to the input signal and the first reference voltage to turn on or off the connection with the output terminal, wherein the input signal is at a ground voltage and a first a reference digital signal between the voltages, and the voltage level of the first reference voltage is less than a voltage level of the second reference voltage; a reverse circuit receiving the input signal, inverting the input signal, and converting the input The signal is a digital signal that transitions between the ground voltage and the first reference voltage to generate a control signal; and a pull-up circuit coupled to the path circuit and the reverse circuit to receive the first reference voltage and the control And transmitting a signal to the first reference voltage according to the control signal. 2. The voltage level shifter of claim 2, wherein when the input signal is equal to the second reference voltage, the path circuit is disconnected from the output terminal, and the input signal is fresh. At the grounding, the connection of the path circuit to the stray terminal is turned on and the input signal is transmitted to the output terminal. 3: The voltage level shifter according to claim 2, wherein when the connection circuit has no connection (4), the reverse circuit correspondingly generates a control signal equal to the ground voltage. If the control signal is equal to the ground voltage, the pull-up 15 20124225237081 twf.docA outputs "5 to the first reference voltage. φ patent $IL circumference of the electric / level transfer device described in item 2, its field. When the connection between the circuit and the output is turned on, the reverse circuit correspondingly generates the control signal 1 equal to the first reference voltage. When the voltage level shifter described in item 5 of the Φ monthly patent circumstance is equal to the first reference voltage, the pull-up circuit is π 匕, and the 5 玄 output signal is equal to the ground voltage. The first-stage voltage level shifter of the range has a first-channel control terminal having the first-side control terminal receiving the first reference power m=and the control (four)/, and the second terminal end thereof receiving the first-end reception The input signal 'in the direction of the voltage level shifter as described in item 1 of the power supply & exclusive range, the end, a: one two: ^ wide body 'with the first end, the second end and the control ', 4 is connected to the first-reference voltage, the control end receives the round-in signal 2 and the second end generates the (4) signal; and the input end, the j-body 'has the first end, the second end, and the control receiving leaf The second end of the human-reverse transistor receives its input domain and its second end receives the grounded electrical waste. The electric fresh-spot transfer device described in the first item, the first-: two-body end and the control end, the deficient voltage, the control end receives the control signal, 201242252 099012 37081twf.doc/I The two ends are coupled to the output end. a voltage level shifter that receives and transfers a voltage level of an input signal to generate an output signal at the output terminal, comprising: an L circuit is lightly connected to the output terminal, and receives the input signal and a reference voltage 'According to the input of the money, it is difficult to use the circuit and the output terminal _-, etc., where the input signal is in the ground voltage and the digital signal of the first reference voltage _ state; Connected to the path circuit, receiving the input signal to the reverse circuit and converting the input signal to a digital signal that is transitioned between the (four) reference voltages to generate a test voltage _ voltage 2, the voltage level of the 11th voltage is greater than the The first-parameter ri: the circuit and the reverse circuit receive the = number, and according to the control signal, pull up the voltage level. When the input signal is equal to the first reference voltage, the equivalent resistance is adjusted to be equal to the low impedance value, and the wheel signal is transmitted to the 5th round out terminal through the path circuit, when the input signal is equal to the ground voltage, The path circuit is equal to - high resistance Value. =·~胄凊 Voltage level transfer as described in the patent U. When the input signal is equal to the first reference voltage, the reverse battery generates the control signal specific to the ground voltage. For example, the voltage level transfer 17 201242252 w^yuiz 37081 twf.doc/I device described in claim 12, wherein when the control signal is equal to the ground voltage, the pull-up circuit pulls the output signal to the first Two reference voltages. 14. The voltage level shifter of claim 11, wherein the reverse circuit produces the control signal equal to the second reference voltage when the input signal is equal to the ground voltage. 15. The voltage level shifter of claim 14, wherein when the control signal is equal to the second reference voltage, the pull-up circuit is disabled and the output signal is equal to the ground voltage. 18